RDC & 2000 Server TS

For the last few months, I've had access to our TS at work with my OS X.
Good job BTW guys.

Here's the new problem, Our IT Dept just ended up rebuilding the server and
now I can't get in. IT told me to reinstall my client, so I did, but I
still keep getting this message
"The Client could not connect to the remote computer. Because of a security
error, the client could not connect to the remote computer. Verify that you
are logged on to the network, and then try connecting again."

My guess there is a preference file that I have to blow away, but I can't
seem to find it.

Also, I found this on the web. http://www.barjohn.com/tn003.htm. Was
curious how to get these settings into the MAC version (i.e. No Regedit
here)

Thanks in advance
OS X Ver 10.2.6
RDC 1.0.1 (030206)