Fresh install of Truenas 12.0U2.1

Add new group "group1"

Add new user "user1"

Add new dataset "ds1"

Add new smb share "ds1"

Set as "restricted" ACL with user1/group1 applied.

Set SMB service netbios name "server1"

Now from Windows client logged in as "user1", mount "ds1" and add a file.

Right click new file > properties > security

I see 1x entry for "SERVER1\user1" displayed correctly

but group shows as "Account Unknown (incorrect id)"

-----------------------------

If I revert netbios name, I see:

1x entry for "SERVER1\group1" displayed correctly

but user shows as "Account Unknown (incorrect id)"

Ref link I found:

https://www.truenas.com/community/threads/group-permissions-not-showing-up-in-windows-10-client.71337/

Instructions from ^ forum post seem to resolve the issue.

service samba_server stop
mv /var/db/system/samba4/group_mapping.tdb /var/db/system/samba4/group_mapping.tdb.bak
service ix-pre-samba start
service samba_server restart