We have a 2008 Active Directory Network. We recently started using 3 New Windows 7 machines for the domain administrators. We also have a large facility with 3 different IP subnets. When one of the administrators goes to a different area and uses his computer on a different subnet, when he comes back to his office he can not log in to his computer. He gets the error bad username or password. Then he can not log in to the network. Also, he is using kerberos to connect to client access for the iSeries. He can log in to his computer if he disconnects the network cable. Then when he reconnects the cable he gets kerberos credentials not foound.