Implementing ISA Server Publishing in Visual C#.NET

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Implementing ISA Server Publishing
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the folder, then only requests for www.cohovineyard.com/sales will be forwarded by this rule.
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Figure 8-13 Configuring the public name for a Web publishing rule
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In almost every case, you should use a specific public name rather than use any domain name when publishing a Web site. Choosing a specific public name means that ISA Server will only accept requests that use that name in the request header, and that all other requests will be dropped.
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6. On the Select Web Listener page, select a preconfigured Web listener or click New to create a Web listener. 7. On the User Sets page, configure the user sets that will be allowed to access the published Web site. By default, the All Users user set, which includes anonymous users is granted access. 8. On the Completing the New Web Publishing Rule Wizard page, review the configuration and then click Finish. You can also modify the configuration for the Web publishing rule after you configure the rule. To modify the configuration of the Web publishing rule, select Firewall Policy in the ISA Server Management Console and double-click the rule. Most of the configuration options are identical to the options available when you created the rule, with some additional options. For example, you can configure a schedule for when the publishing rule will be available. Moreover, you can configure how ISA Server will forward
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Configuring Web Publishing Rules
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requests to the published Web server. To configure this option, open the Web publishing rule properties and select the To tab, as shown in Figure 8-14.
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Figure 8-14
Configuring ISA Server proxy requests to a Web server
Note
For an explanation of when to use the option to forward the original host header, see Table 8-2.
ISA Server provides two options for proxying requests to the published server:
Requests Appear To Come From The ISA Server Computer This is the default option. When this is configured, the ISA Server computer substitutes its own IP address for the original client IP address when forwarding the request to the Web server. This means that if you enable logging on the Web server, all client connections will appear to come from the ISA Server computer. Requests Appear To Come From The Original Client When you select this option, ISA Server sends the original client IP address to the published Web server. Some applications require that the actual client IP address be sent to the Web server. In addition if you want to log the client IP addresses for all connections to the Web server, you need to enable this option.
Exam Tip
Remember that, by default, client IP addresses are not sent to the published Web server. If you see an exam question that requires the logging of the client IP address in a Web publishing scenario, you must change the default configuration.
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Implementing ISA Server Publishing
Real World
Implementing Complex Web Publishing Scenarios
ISA Server 2004 provides a great deal of flexibility when configuring Web publishing rules. In fact, you can enable almost any Web publishing scenario with single ISA Server computer. This includes some of the complicated scenarios that I have encountered when working with large corporations. Some requirements that can complicate Web publishing include the following:
The need to publish multiple Web sites that have different domain names. These Web sites may be hosted on a single Web server, or on multiple Web servers. The need to use a single IP address to publish multiple Web sites. The need to publish a Web site with a single domain name that is distributed across multiple internal Web servers.
For most of these scenarios, there is more than one way to solve them. You can use path mapping and link translation to deal with some complex situations. Here are some other suggestions:
If you need to publish multiple Web sites that have different domain names or different host names, you have to configure multiple Web publishing rules. For example, if you are publishing www.cohovineyard.com and www.cohowinery.com on the ISA Server computer, you will need two different Web publishing rules, each with a different public name. The same is true if you are publishing the www.cohovineyar d.com site and the store.cohovineyard.com site. The configuration is easy when the Web sites are on different Web servers; you just create two Web publishing rules pointing to the two Web servers, and correctly configure the public name for each publishing rule. If the Web server has multiple IP addresses assigned to it, you can configure the Web server to listen for HTTP requests on a different IP address for each Web site, and then configure ISA Server to forward the Web requests to the appropriate IP address. If the two Web sites are on the same server and the Web server only has one IP address, the configuration is a bit more complex. You will still need two Web publishing rules, each configured with the appropriate public name. However, when you configure the Web publishing rule, you need to configure it to forward the original host header to the published server. Then on the Web server, ensure that the Web sites are distinguished by the host headers.
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