Log on locally as a local administrator. In the Network tool of Control Panel, select Change and enter a Workgroup name, leaving the domain. Restart the computer and log on locally as a local administrator.
There are two methods to rejoin the domain:
|•||You can join the domain from the client if at the same time you can provide an administrator username and password on the domain.|
|•||You can delete the existing computer account in Server Manager, recreate the computer account, synchronize the domain, and then on the client rejoin the domain.|