RPC clients cannot connect to the servers that are behind ISA Server (312893)

The information in this article applies to:

Microsoft Internet Security and Acceleration Server 2000

This article was previously published under Q312893

SYMPTOMS

Remote Procedure Call (RPC) client computers (for example, Microsoft Outlook clients that use RPC), cannot connect to an RPC server (for example, a Microsoft Exchange server that is behind Internet Security and Acceleration [ISA] Server) when the RPC server has more than four Internet protocol (IP) addresses that are bound to its network adapter. This problem occurs when you use server publishing to publish the multihomed RPC server on the ISA Server.

CAUSE

This problem occurs because the RPC filter in ISA Server does not publish when the server that is hosting the RPC program is multihomed with more than four IP addresses.

RESOLUTION

To resolve this problem, obtain latest service pack for ISA Server 2000. For more information about the latest service pack, click the following article number to view the article in the Microsoft Knowledge Base:

313139 How to obtain the latest Internet Security and Acceleration Server 2000 service pack

WORKAROUND

The work around this problem, reduce the number of IP addresses to less than four IP addresses that are bound to the RPC server.

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

This problem was corrected in ISA Server 2000 SP1.

Modification Type:	Minor	Last Reviewed:	10/24/2005
Keywords:	kbenv kbfix kbprb KB312893