Okay, this one has me stumped. I, for the life of me, cannot figure out why I can't get this PC to join to the domain. It's an HP nc6400 laptop running XP SP3. I'm attempting to join it to the domain over a VPN connection, which I have done many many times without a problem. I am able to browse to the domain controller and access resources using the same admin credentials I am using to join it to the domain. Help!