can you telnet from your W2k to your Sun box???
if you cant' then you have a problem with your telnet setup in which case you should check your /etc/services file for Telnet services and then do a #ps -ef |grep telnet and look for a process called in.telnetd ...but if you can then i would try this>>>

well the first thing i would check is to see if the CONSOLE line in the /etc/default/login is commented out or not.

# vi /etc/default/login

CONSOLE=/dev/console

is the line you are looking for and you would want to put a # sign in front of it.

#CONSOLE=/dev/console

this will allow connection to the box from remote locations.
this line tells the system that you must login at the console