did you try tcp only mode? also I think it is important that the deubgger and debugee runs under the same user account.

Cris
 Trying to remotely debug (Windows Server 2003) with Visual Studio .NET 2003 and get this error:

 "Unable to start debugging on the web server. The RPC server is unavailable"

 Followed the instructions on the MSDN site to setup remote debugging, http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vsdebug/html/vc
tskinstallingremotedebugmonitor.asp

 But still having problems.

 Any help would be apprechiated.

 Cheers daren

I've been trying to figure this out for myself for the last three days (actually, on and off for what seems like forever). The problem is with the Windows Firewalll on the CLIENT. Try stopping the service, and see if it works. It finally did for me.
Good luck

From http://www.developmentnow.com/g/58_2005_3_0_0_368720/Trying-to-remotely-debug-Wi
ndows-Server-2003-with-Visual-Studio--NET-2003-and-get-this-error.ht