Article ID: 259240 - View products that this article applies to.
This article was previously published under Q259240
This article describes how to set up Microsoft Outlook Web Access (OWA) to connect to Microsoft Exchange Server through a firewall. This configuration assumes that there is a firewall between OWA and the Exchange Server computer. There are three ports that need to be opened on the firewall in this configuration. On the Exchange Server computer, two ports need to be statically mapped. To do this, the ports must be opened by editing the registry.
Note The third port, port 135, must be opened on the firewall.
Follow the steps in this section to statically map the two ports on the Exchange Server computer. The Exchange Server computer that OWA points to must have these ports mapped.
Note One port must be mapped for the information store, and one port must be mapped for the directory.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
(https://support.microsoft.com/kb/179442/ )How to configure a firewall for domains and trusts
Article ID: 259240 - Last Review: October 28, 2006 - Revision: 4.8
Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.