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April 3, 2011 by Paul Cunningham 22 Comments TweetOne way to make Exchange Server 2010 Outlook Web App (OWA) available for remote users is to publish it using ISA Server 2006.
This diagram provides an overview of how Outlook Web App is published using ISA Server 2006. The ISA server needs to be configured with an SSL certificate to accept the secure remote access connections. For more details see this article on exporting an SSL certificate from Exchange 2010 (note that it refers to importing it for Exchange 2003 but the steps are the same for importing to an ISA Server 2006 firewall running on Windows Server 2003). In the ISA Server Management console right-click the Firewall Policy and choose New -> Exchange Web Client Access Publishing Rule. Set the Exchange version to Exchange Server 2007 (yes this is correct for Exchange 2010 publishing) and tick the box for Outlook Web Access, then click Next to continue.
Configure the public names that this rule should accept connections for and click Next to continue. A list of valid certificates will appear, which should include the one you imported to the server earlier. Leave the authentication delegation set to Basic Authentication and click Next to continue. Before you click Finish to create the new rule first click on the Test Rule button to validate the settings you chose. Before applying the changes to the Firewall Policy double-click the new rule to open its properties.
Now that the rule has been configured we can test it from outside of the firewall using a web browser. However after logging in the Exchange Server 2010 Outlook Web App interface will be available to the remote user. TweetTutorials Exchange 2010, ISA 2006, OWAAbout Paul CunninghamPaul is a Microsoft MVP for Office Servers and Services, specializing in Exchange Server and Office 365, and is the publisher of Exchange Server Pro. Publishing Outlook Web App with ISA 2006 is a quite strait forward and easier because you can test it directly. I’m not 100% sure about the correct setting for these 3 directories so I wanted to double check with you guys! I guess, the question remains, are these paths (Exchange, Exchweb and public) necessary on a Exchange 2010 environment? The Mailbox Replication service was unable to determine the set of active mailbox databases on a mailbox server. Next day I had just started all above mentioned services at (exchange server 2 with no Sp1). Can you let me know if there is no problem I can uninstall or remove from control panel (exchange server 2 with no Sp1) exchange server from exchange environment (exchange server 2 with no Sp1 has no mailbox at its databases), and will it not effect to main exchange server 2010 sp1 (HT,CAS, mailbox). I have a issue i have exchange 2007 and isa 2006 everything was working fine suddenly when i try to login through browser to exchange in internal lan i cannot go through where as when i try it i get the login screen and i can login and browse mails. Web Publishing and Server Publishing Rules allow you to make servers and services on ISA firewall Protect Networks available to users on both protected and non-protected networks.
Web Publishing Rules and Server Publishing Rules provide very different feature sets and are used to different purposes. Web Publishing Rules provide proxied access to Web sites located on an ISA firewall Protected Network. The ISA firewall’s Web Proxy filter handles all incoming Web connections made through Web Publishing Rules. One of the major advantages of using Web Publishing Rules to publish Web sites on ISA Firewall Protected Networks is the ISA firewall’s ability to perform very deep application layer inspection on all connections made to published Web sites. Deep application layer inspection for Web requests is the responsibility of the ISA firewall’s HTTP Security Filter. Web Publishing Rules allow you to redirect connections based on the path indicated by the external user. Web publishing rules can be configured to forward authentication credentials to the destination Web server. The ISA firewall’s authentication delegation option allows the ISA firewall to authenticate the user and then forward the user credentials to the published Web site when the Web site request credentials using a variety of methods, including authentication protocol transition. Delegation of authentication also prevents the user from being subjected to double authentication prompts. Caching responses from published Web sites reduces the load on the published Web server and on any network segments between the ISA firewall and the published Web server.
Web Publishing Rules allow you to publish multiple Web sites using a single IP address on the external interface of the ISA firewall. For example, suppose you have a single IP address on the external interface of the ISA firewall. The key to making this work is to make sure that the public DNS resolves the fully qualified domain names to the IP address on the external interface of the ISA firewall. The ISA firewall’s link translator can be used to re-write the responses published Web servers send to users making requests to the published Web server. For example, suppose you publish a Web site that hard codes the URLs in its responses and the hard-coded URLs include the private names of servers on the Protected Network.
The good news is that the new ISA firewall gives you the choice between forwarding the ISA firewall’s IP address to the published Web server or forwarding the actual remote Web client’s IP address to the published Web server.
RSA’s SecurID is a two-factor authentication mechanism that requires that the users have something (the SecurID token) and know something (their user credentials).
Some organizations will choose to put the ISA firewall in a location where making the firewall a member of the user domain is not the best option. The ISA firewall can be configured as a RADIUS client to a RADIUS server on the corporate network. RADIUS does suffer from a lot of disadvantages and for this reason the ISA dev team upped the ante by allowing us to use LDAP authentication for Web Publishing Rules, which among other things, allows you to leverage Active Directory users and groups when setting your authorization requirements for Web Publishing Rules. ISA Firewall Web Publishing Rules allow you to control when users can access the published Web site.
With the new ISA firewall (2006) you have a lot more control over how the ISA firewall handles certificates.
I’ve spent a lot of time here at ISAserver.org explaining how to configure various aspects of the ISA firewall system, but I haven’t spent much time explaining what all these features do, which doesn’t help out folks who aren’t sure if the ISA firewall will do what they want to do, or those people who are trying to discovery what this ISA firewall is and what it does. Cloud Admin CON is a cost-effective, convenient opportunity for busy System Administrators and IT Managers to stay up to date on the most recent industry trends and vendor solutions and build their network of IT experts and vendors.
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How to publish the autodiscovery feature that allows the Outlook 2007 client to automatically configure itself to use the ISA Firewall as its reverse Web Proxy. If you would like to be notified when Thomas Shinder releases the next part in this article series please sign up to the ISAserver.org Real Time Article Update newsletter.
After working with the same product for almost eight years, you begin to take some things for granted and do not think about how they work and how other people might have difficulties understanding the concepts when these concepts are new to them. I have to give Jim Harrison and Jason Jones credit for working with me in the process of figuring out how to use a single Web listener to publish two secure Web sites. First, let’s review what happens when the Outlook client tries to gain autodiscovery information. As you can see, this might present a problem, since when you are publishing your OWA, ActiveSync and Outlook Anywhere sites, you are going to need two different FQDNs and hence two certificates to publish the Exchange Web services sites and the autodiscover site. In my way of thinking, we would need at least two IP addresses on the external interface of the ISA Firewall.
While all that is well and good for ISA 2004 Firewalls, it is not required with the 2006 ISA Firewall. A Web Listener is a software component that accepts connections from non-Web Proxy clients and forwards the connections to the ISA Firewall’s Web Proxy filter. On the Authentication tab you set what method of authentication you want the client to use to authenticate with the ISA Firewall.
As you can see, the user is authenticated twice – by the ISA Firewall and then by the published Web server.
On the Networks tab you define the IP addresses that the Web Listener will listen on for incoming connections. Now that we see that multiple IP addresses can be bound to a single Web Listener, the next thing we need to take care of is binding a certificate to each of those IP addresses. The figure below shows how to bind the certificate to an IP address handled by the Web Listener. In the figure below you can see the Properties dialog box of our Outlook Anywhere Web Publishing Rule. On the Paths tab is a list of paths that this Web Publishing Rule will forward connections to. Now we see how we can publish multiple SSL sites with different public names using a single Web Listener and a single Web Publishing Rule.
Publishing Exchange Server Client Access with ISA Server should be a straightforward and easy task. Some of the technical information needed is somehow dispersed through several sites and articles and I usually end up spending a lot of time searching for that particular solution that I know will solve my problem.
This is meant to be an objective article, so I’ll try not to lose too much time diving into some more deep technical content.
On the Internal Network IP Addresses page, you’ll see the addresses that will be configured to define the default ISA firewall Internal Network.
When you install Exchange 2007, you can install a default Secure Sockets Layer (SSL) certificate that is created by Exchange Setup. To obtain a new server certificate using the Web Server Certificate Wizard, in IIS Manager, expand the local computer, and then expand the Web Sites folder. On the Delayed or Immediate Request page, select Send the request immediately to an online certification authority if you have a Windows Server 2003 enterprise CA installed in your domain. If you’ve selected Send the request immediately to an online certification authority, accept the default port of 443 on the SSL Port page and from the list under Certification authorities, select the correct internal enterprise CA. If you’ve selected Prepare the request now, but send it later, save the request to a text file and submit it using a browser. The next step is to install server certificate on the ISA Server computer, to enable a secure connection between the client computer and the ISA Server computer.
To confirm that forms-based authentication is not selected on an Exchange front-end server, start Exchange System Manager, expand Servers, and then expand your front-end server.
To make your Exchange Front-End server an RPC proxy server, expand Servers, right-click your front-end server, and then click Properties. To confirm that forms-based authentication is not selected on an Exchange CAS, in the Exchange Management Console, expand Server Configuration, and then click Client Access.
Select the Authentication page and confirm that the following are selected: Use one or more of the following standard authentication methods and Basic authentication (password is sent in clear text).
Before entering the publishing rules section, let’s take a look how ISA Server pre-authenticates client requests. Step 1, receipt of client credentials: The client sends a request to connect to the corporate Outlook Web Access server in the Internal network. Steps 2 and 3, sending credentials: ISA Server sends the credentials to the authentication provider, such as a domain controller for Integrated Windows authentication in Active Directory, or a RADIUS server, and receives acknowledgment from the authentication provider that the user is authenticated. Step 4, authentication delegation: ISA Server forwards the client's request to the Outlook Web Access server, and authenticates itself to the Outlook Web Access server using the client's credentials. Step 5, server response: The Outlook Web Access server sends a response to the client, which is intercepted by ISA Server.
Remember that Active Directory validation can only take place when ISA Server is a domain member (either the same domain as the domain controller or in a trusted domain). In order to use RADIUS, you can install the IAS service on any Windows 2003 member server on your internal network.
ISA Server can connect to an LDAP server in any of the ways described in the following table. Table 1 To use LDAPS or LDAPS using global catalog, a server certificate must be installed on the LDAP server and the root certificate from the issuing CA needs to be installed on the ISA Server computer. On the Client Connection Security screen, select Require SSL secured connections with clients. On the Web Listener IP Addresses, Listen for requests on these networks select Internal, since we have only one network interface. Click Select Certificate and choose the certificate previously installed on the ISA Server.

Select HTML Form Authentication for forms-based authentication and select the appropriate method that ISA Server will use to validate the client's credentials. Review the selected settings, and click Finish to complete the wizard.Since we want our users to type in a simple URL without HTTPS (ISA will do the redirection), we must now modify the Web Listener just created, in order to provide access to HTTP. To create an Exchange Web client access publishing rule, in the console tree of ISA Server Management, click Firewall Policy.
We already saw how to enable HTTP to HTTPS redirection in the Web Listener creation process.
In the ISA Firewall console, click the Firewall Policy node in the left pane of the console. On the Publishing Type page, select the Publish a single Web site or load balancer and click Next. On the Server Connection Security page, select the Use SSL to connect to the published Web server or server farm. On the Internal Publishing Details page click Next.On the Public Name Details page, enter the public name.
On the Select Web Listener page, click the down arrow on the Web listener drop down list and select the listener we use for the Exchange publishing rule.
On the Authentication Delegation page, accept the default entry, No delegation, and client cannot authenticate directly. Click Finish on the Completing the New Web Publishing Rule Wizard page.Double click the OWA Redirect rule we have just created. Make sure that the Deny rule is below the Exchange Web Client Publishing allow rule, as seen in the figure below.
If everything is working, you’ll be presented with the HTML form authentication, and after a successful logon, the Outlook Web Access page will appear, as illustrated in the pictures below. ISA Server 2006 introduced some new features and publishing wizards that can make the task of publishing Exchange much easier. The scenario I used in this series of articles is the most common I find with my customers. Properly configure IIS on your Client Access Server (CAS) to host the certificate(s) needed for external and internal access. Note: For this article, we will be using a UC certificate that contains 4 Subject Alternative Names (SANs). At the minimum, the ISA 2006 Supportability Update is required which is located here.  I would recommend using SP1 instead which is located here. You must ensure that you go onto the CAS and export the certificate with its private key and import that into ISA 2006 (Please make sure you have the licenses needed for installing a certificate on multiple servers if required by your certificate vendor).
Enter the Internal Site name of your Enterprise Vault Server.  Then enter the IP Address of your Enterprise Vault Server. Because the IIS directory name on your Enterprise Vault Server is called EnterpriseVault, you must enter that name in the Path (Optional) field as is displayed in the following screenshot.
Once you have finished the creating the publishing rule, go into the properties of your Enterprise Vault publishing rule and go to the Paths tab.  Ensure your paths display as follows (which they should if you followed the above correctly). If you have multiple EV sites, I’d assume that you would just create multiple ISA rules for each of your EV Sites and have them all go through the webmail name as I instructed in the article. What we have done is we created a second website (with a different IP) on the CAS boxes, configuring it for basic authentication and creating the necessary CAS hooks with powershell.
The next challenge was to make Evault in OWA and Outlook work correctly on kiosks (where the windows user is not necessarily the same as the user’s mailbox).
Do you know what kind of certificate do i need to use to push then HTTPS on Enterprise Vault.. It seems like after logging into OWA, ISA tries to fetch the EV icons and scripts from the EV server instead of using the CAS RPC extensions. I too get similar two auth like Jorge, Is there a simple way other than creating second owa directory ?
We had also two exchange servers 2010, main exchange server (exchange server 1) had role (CAS, HT and mailbox) with sp1 and other exchange 2010 (exchange server 2 with no Sp1) who had only mailbox role.
Yesterday I had unmounted databases at exchange server (exchange server 2 with no Sp1) and stop the exchange services include exchange AD topology service, www publishing service and Net.
At (exchange server 2 with no Sp1) did not initialized the exchange management console because (exchange server 1 ) is installed sp1 of exchange server, but (exchange server 2 with no Sp1) is has no exchange SP1.
Web and Server Publishing Rules allow you to make popular services, such as SMTP, NNTP, POP3, IMAP4, Web, OWA, NNTP, Terminal Services and many more available to users on remote networks or on other Internal or Perimeter Networks. In general, Web Publishing Rules should always be used to publish Web servers and services, and Server Publishing Rules should be used to publish non-Web servers and services. Any Network that is not part of the default External Network is considered an ISA firewall Protected Network.
Even when you unbind the Web Proxy filter from the HTTP protocol definition, the Web Proxy filter is always enabled for Web Publishing Rules. This deep application layer inspection prevents attackers from sending malicious commands or code to the published Web site. The ISA firewall’s HTTP Security filter allows you to control virtually any aspect of an HTTP communication and block or allow connections based on almost any component of an HTTP communication. Path redirection allows you to redirect connections based on the user’s indicated path to an alternate directory on the same Web server, or to another Web server entirely. ISA 2004 was limited to only basic delegation, but ISA 2006 provides a much richer selection of authentication delegation.
Instead of allowing unauthenticated connections to the OWA Web site, the ISA firewall’s Web Publishing Rule for the OWA Web site can be configured to authenticate the user.
You can configure Web Publishing Rules to allow only certain user groups to access the published Web site. For example, the user might authenticate using a User Certificate, and then the user’s credentials can be forwarded as Kerberos authentication.
Instead of the user answering the Web site’s request for authentication, the ISA firewall answers the request, after the ISA Firewall successfully authenticates the user.
Once a user makes a request for content on the published Web site, that content can be cached (stored) on the ISA firewall. Since the content is served from the ISA firewall’s Web cache, the published Web server isn’t exposed to the processing overhead required to service those Web requests. You may wish users always receive the freshest versions of content in some locations on your published Web server, while allowing the ISA firewall to cache other content on the published Web servers for a pre-defined time period. The ISA firewall can do this because of its ability to perform stateful application layer inspection. Once the DNS issue is addressed, publishing two or two-hundred Web sites with a single IP address is very simple using the ISA firewall’s Web Publishing Rules. The link translator is useful when publishing Web sites that include hard-coded URLs in their responses and those URLs are not accessible from remote locations.
For example, when you are not using SSL from the ISA firewall to the Web server, but you are using SSL between the Web client on the Internet and the ISA firewall, then the link translator can change the HTTP response returned by the Web server to an SSL response in the links presented to the user. This was a major barrier to adopt for many potential ISA Firewall administrators because they already had significant sunk costs in log analysis software installed on the published Web servers. If you don’t need the actual client’s IP address in the Web server’s log files, then use the default option, which is to replace the client IP address with the ISA firewall’s network interface address.
The ISA firewall comes with built-in support for SeurID authentication for Web servers and services published via Web Publishing Rules. For example, if you have a back to back firewall configuration where the front-end firewall is an ISA firewall, you might not want to make the front-end ISA firewall a member of the user domain. The RADIUS server can then be configured to authenticate users against the Active Directory or any other RADIUS compliant directory on the corporate network.
You may have some Web sites that you only want accessed during work hours, and other Web sites that have high bandwidth requirements that you only want accessed during off-hours.
Port redirection allows the ISA firewall to accept a connection request on one port and then forward that request to an alternate port on the published Web server.
In contrast to port redirection, where the only change is the destination port, the ISA firewall’s support for protocol redirection allows you to publish FTP sites using Web Publishing Rules. For example, if you are using User Certificate authentication, you might want to make sure that the User Certificate was generated by a specific CA. Individual focus sessions are scheduled to run consecutively, allowing you to attend all sessions, or selectively choose only those you wish to attend.
Even worse, when you work with the same product for so long, you take it for granted that you understand certain concepts and how to work with them, when in fact you might not really understand them at all. The problem I had was that I was still thinking in terms of how the 2004 ISA Firewall handled secure Web Publishing Rules and Web listeners. When an Outlook 2007 client is not domain joined, the client uses a predefined set of URLs to gain access to the autodiscovery site on the Client Access Server. A Web listener is similar to the Web proxy listener that is associated with each ISA Firewall Network (if you choose to enable the Web Proxy listener on a particular ISA Firewall Network). Here you can give the Web Listener a name and provide a description for the purpose of the Web Listener.
Only after successfully authenticating with both devices is the connection allowed to the published Web server.
In ISA 2004, selecting forms-based authentication for Outlook or any non-Web browser client would not work, because the non-Web browser application would not know what to do with the form. When you use the Web Publishing Rule wizard for Exchange services, you do not need to make any changes in this dialog box regarding Form Customization. Users who authenticate with any of these domains will not need to reauthenticate when connecting to another server within the same domain.
In the example you see below, the Web Listener is configured to listen on two IP addresses bound to the external interface and one IP address bound to the internal interface. First you select the IP address as shown in the figure above and then click Select Certificate.
That is OK, because the Web Listener that is used by this Web Publishing Rule is configured to listen on these IP addresses and each IP address has the correct Web site certificate bound to it with a common name that matches one of these Public Names.
The key to understanding how we can do this is to understand that a single Web Listener can be listening on multiple IP addresses and that you can bind a separate certificate to each IP address.
I’ll enumerate the necessary steps to reach the main goal and they will be illustrated with lots of pictures. In order to provide you the “Complete Solution” I had to keep focused on one particular configuration or it would be impossible to write an online article about it.
I’ll skip the ISA Server setup procedure, so we’ll start from the point where the ISA is already installed in a Windows Server 2003 environment that doesn’t belong to a domain. If this certificate is from an internal CA you’ll need to install the CA certificate on both servers and your clients must all trust that same internal CA.
However, it is not recommended to use it, since this certificate is not a trusted SSL certificate. Otherwise select Prepare the request now, but send it later.Enter the required information on the Name and Security Settings and the Organization Information pages. If a private CA is used, the root CA certificate from the private CA will need to be installed on any client computer that needs to create a secure connection (an HTTPS connection) to the ISA Server computer.
Right-click the Web site for the Exchange services, and click Properties.On the Directory Security tab, click Server Certificate to start the Web Server Certificate Wizard. We also saw how to configure ISA Server in a unihomed configuration and how to generate, export and import certificates. Expand Protocols, expand HTTP, right-click Exchange Virtual Server, and then click Properties.
Select the RPC-HTTP page, select RPC-HTTP front-end server, and click OK to close the properties dialog box for the selected server.
Select your Client Access server and then select owa (Default Web Site) on the Outlook Web Access page.
The Outlook Web Access server will revalidate those credentials, typically using the same authentication provider. In LDAP server set name, type the name of the domain.Click Add, to add each LDAP server name or IP address. For Exchange 2003 you can choose all the methods in one rule; for Exchange 2007 you must create separate rules for each access method. The internal site name must match the name of the server certificate that is installed on the internal Exchange Client Access server. If you later have problems with this rule, to troubleshoot it, start by modifying the User Set to All Users.

Click the Apply button in the details pane to save the changes and update the configuration.If you are using different internal and external names, for RPC over HTTP(s) to work you must make a modification in the publishing rule.
This option actually has no meaning in this scenario, since no connections will be forwarded by this Deny rule. There’s no need for the client to authenticate in this scenario, since we want the connection to be automatically redirected for everyone.
Go to the Action tab and put a checkmark in the Redirect HTTP requests to this Web page checkbox. If it is not, use the up down arrow buttons in the MMC button bar to get the rules in the correct order. Nevertheless, there are certain aspects and scenarios that are still difficult to find the right solution for. The certificate recommended for this configuration is a Unified Communications (UC) certificate. But since you are requesting a certificate, I would advise you to properly create a certificate with any other names that are required which include #1-4. I’m trying to get OWA working at a place that has multiple EV sites but all use the same url for webmail.
When you publish a Web site, the ISA firewall’s Web Proxy filter always intercepts the request and then proxies the request to the Web site published by the Web Publishing Rule.
A proxied connection is more secure than a routed and NATed connection because the entire communication is deconstructed and reconstructed by the ISA firewall. This allows the ISA firewall to stop attacks at the perimeter and prevents the attacker from ever reaching the published Web server itself. This means that you can pre-authenticate the user at the ISA firewall before the connection is forwarded to the published Web server.
If the user successfully authenticates with the ISA firewall, then the connection request is passed to the OWA site. So even if users are able to authenticate successfully, they will only be able to access the published Web site if they have permissions to do so. When subsequent users make requests for the same content on the published Web server, the content is served from the ISA firewall’s Web cache instead of being fetched from the Web server itself. And because the content is served from the ISA firewall’s Web cache instead of the published Web site, network traffic between the ISA firewall and the published Web site is reduced, which increases overall performance and efficiency on the corporate network. You can create cache rules on the ISA firewall to get fine-tuned control over what content is cached and how long that content is cached. Part of the ISA firewall’s stateful application layer inspection feature set is its ability to examine the host header on the incoming request and make decisions on how to handle the incoming request based on that host header information. Since these are not fully qualified domain names that are accessible from the Internet, the connections requests fail.
Their only option was to use Server Publishing Rules, which wasn’t a good option because Server Publishing Rules do not confer the same high level of security as Web Publishing Rules. If you need to preserve the remote Web client’s IP address, then you can choose the option to preserve the IP address.
ISA 2006 adds a second two-factor authentication mechanism – RADIUS One Time Passwords (OTP).
You can still take advantage of the domain user database for authentication and authorization by using RADIUS for Web Publishing Rule authentication. RADIUS authentication can be used for both inbound and outbound connections through the ISA firewall’s Web Proxy filter. You can control when users access published Web sites by applying either built-in or custom schedules to your Web Publishing Rules. For example, the ISA firewall can listen to incoming requests on its Web listener on TCP port 80 and then redirect that connection to TCP 8888 on the published Web server on the ISA firewall Protected Network. The incoming HTTP GET request made to the Web Publishing Rule’s Web listener is transformed to an FTP GET and forwarded to the published FTP site on a ISA firewall Protected Network. In the past, the ISA firewall trusted all CAs in the ISA Firewall’s Root Certification Authorities machine certificate store. I found myself in that position last week when trying to figure out how to publish the autodiscovery feature that allows the Outlook 2007 client to automatically configure itself to use the ISA Firewall as its reverse Web Proxy. Once Jim and Jason shook me hard enough, I realized what they were trying to tell me was possible. Because a new feature in the 2006 ISA Firewall enables us to bind multiple certificates to the same Web listener, just as long as each certificate is associated to a different IP address that the Web listener is listening on. However, Web Listeners have additional features over those provided by Web Proxy listeners, which make them ideal for accepting connections to published servers. In this example we want the Web Listener to listen only for SSL connections, so the checkbox for the Enable HTTP connections on port checkbox is cleared. In addition, the user must be authorized to access the Web server – this authorization is enabled in the Web Publishing Rule itself, not by the Web Listener. In contrast, with ISA 2006 Firewalls, the ISA Firewall will examine the client-agent header and if the client-agent is not a Web browser, the ISA Firewall’s Web Listener will fall back to Basic Authentication.
However, since we are using the Web Listener for our OWA Web Publishing Rule, you might want to consider enabling password management features such as Allow users to change their passwords and Remind users that their password will expire in this number of days.
As always, we employ an integrated split DNS infrastructure, so that external clients resolve names to externally accessible addresses and internal clients resolve names to internally accessible addresses.
ISA 2006 Firewalls enable you to bind a certificate to each IP address when you select the Assign a certificate for each IP address option and then click the Select Certificate button.
This enables us to use a single Web Publishing Rule to publish all of these secure Web sites.
In the next article we will build on the 7 part Exchange 2007 publishing scenario and see if we can get Outlook Autodiscovery to work. Although there are lots of resources on the Internet about the subject and Microsoft provides extensive technical documentation with more or less detailed steps, the truth is that every time I go through the process of providing access to Exchange for external users using ISA Server, I can’t help feeling a little bit frustrated. I call it the complete solution (I know it’s kind of pretentious) because it covers all aspects of the most common scenario I keep finding at my customers.
On the General tab, there should be a note that shows You have a private key that corresponds to this certificate.
Click OK.After a certificate is installed for the Web site, you need to require the Web site to only accept secure channel communications. The Web server must be configured to use the authentication scheme that matches the delegation method used by ISA Server. Click Enable HTTP connections on port: 80 and then select Redirect all traffic from HTTP to HTTPS. If you cannot properly resolve the internal site name, you can select Use a computer name or IP address to connect to the published server, and then type the required IP address or name that is resolvable by the ISA Server computer.
If it works, it might indicate that there is an issue with LDAP authentication, which was set in the previous part of this article. Right click the rule, select Properties, go to the To tab and deselect Forward the original host header instead of the actual one (specified in the Internal site name field). Switching OWA on Exchange 2007 to use Basic Authentication instead of Forms Based Authentication allows us to avoid being prompted twice for authentication (once by ISA and then once by Exchange).  Basic Authentication on the CAS allows ISA to pass the authentication through to Exchange without being prompted a second time.
Everything works but I am prompted for credentials the first time Outlook tries to do something with EV such as retrieve or store. Due to what appears to be some fancy javascript employed within the site, straight reverse publishing with link translation results in a non-usable site. When I had stopped these services I got warning at our main exchange server (exchange server 1 with sp1) (Microsoft exchange mailbox replication and still getting warning until I had started services at (exchange server 2 with no Sp1). This allows the ISA firewall to perform very deep application layer inspection of Web requests made to Web sites that have been published using Web Publishing Rules. They determined that non-proxied incoming connections to Protected Network Web servers should always be proxied, to allow for the highest degree of protection for published Web servers and provides a stark contrast to the limited security the typical “hardware” firewall can provide.
This pre-authentication prevents unauthenticated connections from ever reaching the Web server. If the user cannot authenticate successfully with the ISA firewall, then the connection attempt is dropped at the firewall and never reaches the published Web site. In this way, the ISA firewall’s Web Publishing Rules enforce authentication and authorization before access to published Web sites is allowed. Setting up Web Publishing Rules using RADIUS is very easy and allows the ISA firewall support back to back firewall scenarios where the ISA firewall is the front-end firewall. You can tighten things up by customizing the Web listener for the rule to have only a subset of CAs that you want the rule to trust, such as your corporate CA. Web Listeners are called into play only when you associate them with a Web Publishing Rule. This Web Listener is going to be used to accept connections to the OWA, ActiveSync and Outlook Anywhere connections, all of which need to be done over a secure SSL channel.
Therefore, Outlook and ActiveSync clients will use Basic Authentication when authenticating with the ISA Firewall.
Enabling these features will have no effect on the Outlook 2007 clients connecting through this Web Listener, though. This works because we want to use the same authentication at the ISA Firewall for each of these sites. We might even see if we can get the Offline Address Book to work too while we’re at it, and if things go our way, we will see if we can get File Share access from the Exchange 2007 OWA. On the Certification Path tab, you should see a hierarchical relationship between your certificate and the CA, and a note that shows This certificate is OK. Enter the host name that the client will use to connect to the Client Access server in the External Host name field.
This will allow our users to make the connection without explicitly typing the https portion of the URL.
You can use whatever approach you like: use the same internal and external site name, or differentiate them.
Unfortunately, with ISA Server 2006 this is no longer possible because it generates the Event ID 21177. Whilst it is possible to configure individual link translation elements for publishing this website, I found an easier way to get this working.Open IIS Manager on the Operations Manager server. However because they face the internet directly (over a not very stable network link), we want to reduce the attack surface and do load balancing using an ISA server in front.
Pre-authentication blocks attackers and other malicious users from leveraging unauthenticated connections to exploit known and unknown weaknesses in Web servers and applications.
This prevents users from presenting user certificates generated by other CAs that are out of your control. In addition, this Web Listener will be used to accept connections from the Outlook 2007 client to obtain autodiscover information.
Notice that in this dialog box you get information about the Validity of the certificate and the Expiration Date. Click Next, and open the request file that you saved from the Web Certificate Wizard in Notepad. This name should match the common name or FQDN used in the server certificate installed on the ISA Server computer. For purposes of this article, we will only show how to publish your Enterprise Vault rule and steps needed to configure your OWA publishing rule to get Enterprise Vault to work through OWA.
Locate the current Operations Manager Web Console website and choose to create a new Virtual Directory.
In addition, you can set other restrictions on the certificates presented by the users, such as that the certificate contain a specific OID. Paste the entire text of the file, including the BEGIN and END lines, into the Base64 Encoded Certificate Request text box. Confirm that the External authentication method is set to NTLM authentication and click Enable. When the certificate is issued, go back to IIS Manager, right click the web site and on the Directory Security tab, click Server Certificate. Click Close and click OK.Expand the Certificates node, and right-click the Personal folder.
Repeat steps 6 to 11, but when asked where to put the certificate (step 10), select Trusted Root Certification Authorities.

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