[plt-scheme] DrScheme CVS behind a Firewall??

I have a problem accessing the CVS server from behind a firewall.
I had the administrator open port 2401 as I could see this port needed
to be opened from my original run.

Now when I initiatie the login I receive the following:

cvs -d :pserver:anonymous at anoncvs.plt-scheme.org:/cvs login
Logging in to :pserver:anonymous at anoncvs.plt-scheme.org:2401/cvs
CVS password:
cvs [login aborted]: end of file from server (consult above messages if
any)

I couldn't find a FAQ or any other information on the ports to open.
I'm pretty sure this has something to do with the firewall, since all
works OK from home.

Any help is appreciated.

=====
Shawn Legrand 
Carpe Noctem! Carpe Diem! Hieros Gamos!
splegrand at yahoo.com