> sshd[24003]: error: PAM: User not known to the underlying authentication 
> module for illegal user 

I've occasionally had a similar problem.

The most recent time, it was only ssh that couldn't find the user.

'id user' worked, 'su user' worked, 'kinit user' worked.

Only 'ssh user@host' didn't work.

And then, even 'ssh user@host' worked.

I suspect, but can't prove, that it was an intermittent problem talking to the 
AD server.

User's credentials are cached now, so totally not able to troubleshoot further.
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