I've a couple of Linux servers, one setup as a SAMBA AD (ubuntu 18.04), the other as a member server (ubuntu 16.04) setup as a file server.
It was working for a time, but now newer users created (successfully) on the AD server via users and computers (on a windows machine), are not able to use their credentials against the member server. Existing users can use their details normally, and this also syncs password updates etc.
These users are able to use their credentials directly against the AD, for example on login to a domain machine, but not to connect to the fileserver.
to demonstrate the problem fully, I can use 'getent passwd' on the member server, and it gives me a list of users, but not the full list of users from AD. Any user created recently is missing.
How can I diagnose the issue?
N.b 1 - It's not a server I've setup or configured, I've inherited responsibility for it from a leaving staff member.
N.b 2 - I've done the normal searching, and generally only found similar issues which relate to getent only showing local users, which isn't the case for me. (e.g LDAP: getent passwd don't show my recent user addition)