[cvsnt] Help! Upgrading to CVSNT 2.5.03

[Tim Chippington Derrick]

Hi

I posted this problem a few days ago and got no response, so am 
trying again. I can't see what I am doing wrong. I have been using 
CVSNT for more than a year with no problems before now.

I updated a machine (Win XP Pro SP2) that was running CVSNT 2.0.51 to 
2.5.03 and now I can't get any sense out of the CVS server.

If I use pserver, I get error messages like:

c:\users\tim>cvs -d :pserver:tim at timlaptop:2401:/main login
Logging in to :pserver:tim at timlaptop:2401:/main
CVS Password:
cvs [login aborted]: Error reading from server timlaptop: 0: No such 
file or directory

If instead I try to use sspi, I get this instead:

c:\users\tim>cvs -d :sspi:localhost:/main login
Logging in to :sspi:Tim at localhost:2401:/main
CVS Password:
Can't authenticate - server and client cannot agree on an 
authentication scheme (got '')

I followed the advice on http://www.cvsnt.org/wiki/Upgrading which 
suggests just installing over the top of an existing 2.x CVSNT server 
installation. I have also read through 
http://web.telia.com/~u86216177/InstallCVSNT25.html and am still 
having problems. I have looked back in the CVSNT list and didn't yet 
find any other clues there either...

What am I doing wrong? What have I missed?

Tim