Not many people seem to know about this one.........
As is documented, you are not advised to install the Administratio client on the server, you are advised to install it on a workstation. What you don't know is that you can run the admin client on the server, using the following command line.
Go to the RUN window.
c:\lotus\domino\notes.exe admin only
This will bring up the Admin client using the server.id