Article ID: 936702 - View products that this article applies to.
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Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/256986/ )Description of the Microsoft Windows registry
Microsoft Internet Security and Acceleration Server 2006 clients are repeatedly prompted for credentials when they try to access Microsoft Office Outlook Web Access (OWA).
Additionally, if you try to run the Netdom.exe query fsmo command or if you try to run any remote procedure call (RPC)-based tool on the ISA server, you may receive the following error message:
RPC server Unavailable
This problem occurs when the following conditions are both true:
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
To resolve this issue, use Method 1. If Method 1 does not resolve the problem, also use Method 2.
Method 1: Configure the EnableRSS registry value and the EnableTCPA registry value
Method 2: Configure the DisableTaskOffload registry entryIf you continue to receive RPC errors, follow these steps:
Article ID: 936702 - Last Review: January 16, 2015 - Revision: 1.2