I have done following to resolve the issue, nut the end result is not met.
On the Windows client under C:\Program Files\UrBackup there are two files called server_idents.txt and new_server_idents.txt. Deleted them and restarted the service. Then tried the Second option by uninstalling and reinstalling the client again. Restarted the service
Can some one assist me. I am badly stuck here.