Authentication stopped working

[Chris White]

Problem Solved...

New Update to OpenSSH solved the problem, don't know what caused the issue
ain the first place, but with the latest OpenSSH RPM all works fine. I can
only assume that it was, therefore not a kerberos problem. 

Thanks

Chris White wrote:

> I have a dozen RedHat machines that were set up to use kerberos for
> authentication aganst a M$ Active Directory server (managed by a central
> admin department), they get their User account details from a LDAP
> database that I manage (usernames are kept the same). All this was
> configured using the authconfig tool with RedHat. It was all working.
> 
> I updated the system and now it fails to work. All I get, from a remote
> login, is "Connection closed by XXX.XXX.XXX.XXX" instead of being prompted
> for a password. This occures for ALL user accounts, even those that are
> handled by the standard unix passwd file authentication (including root).
> 
> If I disable Kerberos authentication (but leave LDAP user accounts) in
> authconfig then I can login using any account in the passwd fie (ie root),
> but as soon as I re-activate the kerberos authentication it fails.
> 
> I have tried re-installing one machine with redhat 8.0 and it works fine
> until I apply all the updates then the same problem occurs. I have tried
> installing RedHat 9 and have exactly the same problem.
> 
> The Log files are not giving me much help, but it seams that the
> authentication is progressing only to the pam_unix module and no further,
> 
> Sep 16 13:17:18 giants sshd(pam_unix)[7522]: check pass; user unknown
> Sep 16 13:17:18 giants sshd(pam_unix)[7522]: authentication failure;
> logname= uid=0 euid=0 tty=NODEVssh ruser= rhost=<My Host Name>
> 
> Any help would be most appreciated.
> 
> Thanks