I have a WAN connection between 4 different offices. The problem is, I just put a new 2003 Enterprise server with AD in one of my offices. It is setup as a Domain controller incase our connection is lost, they can still connect to the domain. We lose connection to this server once in awhile and can not access it across the WAN. The local office has no problem accessing this server. The only way to reconnect to the server across the WAN is to reboot it. After the reboot, everyone can access it. What would cause this disconnection?