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:


https://access.redhat.com/discussions/2390751

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

https://webtitancloud.freshdesk.com/solution/articles/4000092846-nt-status-domain-controller-not-found-possible-solution