A computer (NT 4.0 Service Pack 6a) in our network is no longer able to communicate with anything outside the LAN. I have done all the common things - restart, install the latest patch, etc. None of these work. There is nothing in the event log as to show a problem. So my question is does anyone know what is happening? and if not can Professional 2000 or Server 2000 be recognized and work in an otherwise NT 4.0 environment. His computer is just part of the network and not a main server. Thanks