Unable to access the server

[Ian]

I experiencing a problem with my laptop...I'm unable to
enter the my server domain at my office. The server will
not recognize my user name/password...I receive an error
message, which requires me to restart the computer.

I discovered that I can work around the problem if I boot
up my computer with the network unplugged, then system
start fine. Then I'm able to plug the network cable into
my system and gain full access to the server.

Anyone have any ideas?