So, here's the scenario. We need to replace defective hardware with a new computer. We don't need to restore anything in particular, we're just going to put a new server in with the same name as an old one to save some reconfiguration issues. Step 1: Dcpromo down the server Step 2: rename Server1 to Oldserver so there is no conflict Step 3: rename new server as Server1 Step 4: Join Server1 to domain So far, so good. However, after joining the domain we get this error: The security database on the server does not have a security account for this workstation trust relationship Verify that the computer account is there and try several combinations of different rejoining and deleting the computer account. No resolve. After a bunch of searching, it turns out that there is a property of a computer account that cannot be repeated in other computer accounts. The servicePrincipalName propery cannot have conflicting values with other computer accounts. Each computer account should ha...