Unable to dial into 2003 server from XP

Hi

Have a laptop running XP Pro and another laptop running
windows 2000 Pro.

Both machines are trying to dial into a 2003 server.

The 2000 Pro laptop can dial in, authenticate, correct
password and works fine. Using administrator as the
account. When dialed in I am able to remotely controll
the server.

Yet I have set up dial in access on the XP laptop. When I
dialin as administrator and try to connect I fail to
connect with "Windows was unable to connect to the network
using the user name and password you provided. then after
three tries I get "incorrect username and/or password was
invalid on the domain". Have tried changing the include
windows domain options, security options and modem options
the administrator account on 2003 server is set for remote
access. But I can connect to the server only to be
rejected at login.

Yet I can connect fine on the 2000 Laptop.

Am puzzled, I have got to be missing something either at
the server end or the laptop end.

Anyone?

Thanks in advance

Calvin