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Configure RPC over HTTP for Outlook 2003

Microsoft Office Outlook 2003 clients can access their mailboxes using RPC over HTTP. To provide RPC over HTTP access to your Exchange servers for your Outlook 2003 users, you need to publish the \rpc virtual directory on your RPC Proxy server through ISA Server.

You can publish this directory by using a Web publishing rule to specify the \rpc virtual directory on the RPC Proxy server. In this example, the RPC Proxy server is located on the Exchange front-end server, but you can also locate your RPC Proxy server on another Web server. For ease of maintenance, we recommend that you use your Exchange front-end server as your RPC Proxy server.

To publish the \rpc virtual directory, create a Web publishing rule.

1. Open Microsoft ISA Server Management, expand the ISA Server computer node, and click Firewall Policy.
2. On the task pane, in the Tasks tab, click Publish a Web Server, to start the New Web Publishing Rule Wizard.
3. On the Welcome page, in the Name field, type a name for the rule, such as Publish RPC over HTTP, and click Next.
4. On the Select Rule Action page, ensure that the default Allow is selected, which will allow requests to reach your Web server according to the conditions set by the rule. Click Next.
5. On the Define Website to Publish page, in Computer name or IP address, specify the RPC Proxy server that you want to publish. This can be the computer name or the IP address of the computer. Select Forward the original host header. In Path, specify the /rpc directory. Click Next.
6. On the Public Name Details page, provide information regarding what requests will be received by the ISA Server computer and forwarded to the Web server. In Accepts request for, if you select Any domain name, any request that is resolved to the IP address of the external Web listener of the ISA Server computer will be forwarded to your website. If you select This domain name and provide a specific domain name, such as www.fabrikam.com, assuming that domain is resolved to the IP address of the external Web listener of the ISA Server computer, only requests for http://www.fabrikam.com will be forwarded to the Web server. Because you are specifying the folder \rpc, that would also be required in the request: http://www.fabrikam.com/rpc. The required request format is shown in Site. Click Next.
7. On the Select Web Listener page, specify the Web listener that will listen for Web page requests that should be redirected to your Web server, and then click Next. If you have not defined a Web listener, click New and follow these steps to create a new listener.

a. On the Welcome page of the New Web Listener Wizard, type the name of the new listener, such as Listener on External network for publishing RPC over HTTP, and then click Next.
b. On the Listener IP Addresses page, select the network that will listen for Web requests. Because you want ISA Server to receive requests from the External network (the Internet), the listener should be one or more IP addresses on the External network adapters of ISA Server. Therefore, select External, and then click Next.
c. On the Port Specification page, the TCP port is set to 80 (default setting). If you want to receive HTTPS requests, select Enable SSL, verify that the SSL port is set to 443 (default setting), and provide the certificate name in the Certificate field. This requires that you have a digital certificate installed on the ISA Server computer. We recommend that you disable the TPC port, and enable SSL, so that only HTTPS (encrypted) communication can take place between the Outlook 2003 clients and your RPC Proxy server. Click Next.
d. On the Completing the New Web Listener Wizard page, review the settings, and click Finish. On the Select Web Listener page, click Next.

8. On the User Sets page, the default, All users, is displayed. This will allow any computer in the External network to access the published Web pages. If you want to specify a specific user set, select All users and click Remove. Then, use the Add button to open the Add Users dialog box, from which you can add the user set to which the rule applies. The Add Users dialog box also provides access to the New User Sets Wizard through the New menu item. When you have completed the user set selection, click Next.
9. On the Completing the New Web Publishing Rule Wizard page, scroll through the rule configuration to verify that you have configured the rule correctly, and click Finish.
10. In the ISA Server details pane, click Apply to apply the changes you have made.

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