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On the ISA Server 2004, create a Web publishing rule that forwards requests from the virtual directory to the internal network.
To create an EnterpriseVaultProxy Web Publishing Rule
In the ISA Server Management console, expand the server name and click the Firewall Policy node.
In the task pane, click the Tasks tab and then click Publish a Web Server.
On the Welcome to the New Web Publishing Rule Wizard page, enter a name for the rule in the Web Publishing Rule name text box. For example, EnterpriseVaultProxy. Click Next.
On the Select Rule Type page, select Allow as the action to take when rule conditions are met. Click Next.
On the Define Website to Publish page, enter the computer name or IP address of the RPC proxy Exchange Server.
Select Forward the original host header instead of the actual one.
On the Public Name Details page, enter the name that external users will use to access the RPC Web site in the Public name box. This must match what is specified in the external DNS entry. Alternatively, select Any domain name in the Accept requests for box and click Next.
On the Select Web Listener page, in the Web listener box, select the listener that you created earlier, when you configured the RPC firewall policy. Click Next.
On the User Sets page, accept the default value, All Users, and click Next.
On the Completing the New Mail Server Publishing Rule Wizard page, click Finish.
Click Apply to save the changes and update the firewall policy.