• Clear all Winbind caches and flush Net cache, always take a backup before deleting.
• Stop the Winbind service and Samba service (if you have it):

      # service winbind stop
      # service smb stop
    

• Clear the Samba Net cache:

       # net cache flush
     

• Delete the Winbind caches:

       # rm –f /var/lib/samba/*.tdb
       # rm –f /var/lib/samba/group_mapping.ldb
     

• Start the Samba (if you have it) and then Winbind services:

        # service smb start
        # service winbind start