Outlook Anywhere fails with RPC-Endpoint 6004 error

hcds
hcds used Ask the Experts™
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We are having troubles with setting up Outlook Anywhere (RPC over http) on SBS 2003.
Microsoft Remote Connectivity Analyzer reports an error when testing the NSPI-interface on Port 6004.
When trying to connect on port 6004 directly from the exchange server/ rpc proxy (single server scenario) the connect failes. Port 6001 and 6002 are able to connect with telnet.
The registry key ValidPorts under HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Rpcproxy are correct. Windows Firewall is disabled.

What can be the reason for this issue?
Regards, Christoph


Scenario:
Small Business Server 2003 Service Pack 2
Exchange 2003 Service Pack 2


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