Hello EE. We have a windows 2003 R2 server running AD, DNS, DHCP, and WINS. Intermittently I have users complaining about logging in to their domain pcs. They get "No Trust Relationship.......". When I check their settings the domain name has changed from the netbios name to the FQDN. When I change it back to the netbios name everything works fine. I am experiencing this throughout the domain. Even when I change it back it goes back to the FQDN setting some time later. What could be causing this?