If you are receiving this error on the System  Setup->Authentication page, "Error: winbindd is not working correctly(wbinfo -t) (-6)", then this is caused by one of the latest Windows Server updates: KB3161949

To resolve this, remove patch KB3161949 from your Active Directory, once the patch is removed, go back to System  Setup->Authentication and click "Save".

For more information:


The symptoms of this can be very similar to another issue, so if this does not work check the following solution