South Africa’s biggest forum. Discuss, discover, and connect with thousands of members.
Are you sure there is still connectivity from the workstation to the domain controller? On the domain controller, have you made sure that the Active Directory service is still running?
Well on the domain controller, do a "net stop netlogon" and then "net start netlogon" from command line to restart Active Directory services.
Also make sure your DNS is configured properly as the client uses DNS to lookup which domain controller to use for the login process.
Another thing is to check that if you have more than one Domain Controller, that they are replicating changes to each other.