>>I am attempting to install a remote SQL Server into Enterprise Manager. This is SQL Server 2000 running on Windows 2000 Server. The client is SQL 2000 Ent. Manager, also running on W2K Server. I can see the remote server and browse directories. However, when I try to register the remote server, I get an error back "SQL Server does not exist or access denied". I'm trying to use the SA account. Any ideas on what the problem is?
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>What is the network connectivity setup for both servers? If using TCPIP, is port 1433 open for both servers?

Yes, TCPIP and 1433 on both. I rebooted the server this morning and everything worked...for a while. Now I have some people that can connect and others that can't.