Hello!

Just registered to post my expirience. I'm using Zentyal servers in my server environments.
One case is Zentyal 3.0 server using samba 4.0.14.
By default W10 domain joining works, but GPOs work only for Domain Administrator accounts, for other domain accounts fails with 1058 error code 5 (Access denied)
To get that working, I had to change max protocol to NT1 and things started working....
...until I found out that randomly on bootup and before login GPO failed with 1058 error code 65 (Network access denied)
Have to say it was not that easy to google about that specific error anymore.

Accessing \\mydomain.lan\sysvol from explorer gave Network access denied error when executed from a non-domain computer.
Sooo I set
RequireMutualAuthentication=0,RequireIntegrity=0 to \\mydomain.lan\sysvol and \\mydomain.lan\netlogon with that GPO hardening setting using RSAT for W10
Now I'm able to access sysvol with entering domain credentials. Havent tested it yet on the pc's that had issues, but feeling that this gonna fix the issue.