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After update to samba-4.8.3-4.el7.x86_64 we need to add domain name when accessing network share from the client (we have classic domain setup).

How reproducible:
smbclient -U user -L //server          # does not work anymore
smbclient -U domain/user -L //server   # new setup

Probably just to notice others.
I don't know how to restore previous behaviour.

Please provide 'testparm -s' output.

Actually, please provide that output for both client and server if they aren't the same machine.

The problematic clients are ten (10) Windows 7 stations (working years with no change, just CentOS 5/6/7 clean update with Samba config files copied to the new system.

After update/reboot to EL7.6, most of W7 was unable to map network share.
The solution was to provide server\username for login.
No password change was necessary. No change at server was necessary.

Created attachment 1511779 [details]
testparm -s on the server

As you have local system account on a classic DC they are probably resolved incorrectly.

I guess the issue would be fixed with: https://bugzilla.samba.org/show_bug.cgi?id=13503

I had the same problem. I think, it is related to

https://bugzilla.samba.org/show_bug.cgi?id=13722

With winbind not running, the fallback to auth module sam_ignoredomain does not work.

Cheers

Heinrich

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:2099