Client could not connect

I had a working remote desktop connection from my
laptop/dial-up connection to my office (host) computer.
I disabled remote connections on the host for a couple of
weeks. Now I have re-enabled remote connections on the
host, and when I try to make the connection from the
laptop using a different dial-up connection than before,
I get the following error message: "The client could not
connect to the remote computer. Remote connections might
not be enabled or the computer might be too busy to
accept new connections. It is also possible that network
problems are preventing your connecton." Any ideas why
it doesn't work any more? Thanks!