having authentication problems on DMZ servers - Likewise Open
We recently rolled out Likewise Open in our environment to address the need to authenticate our Linux servers against Active Directory (AD). We were previously accomplishing this using the pam_smb module, but after we updated our Domain Controllers to Windows 2008, several users were experiencing problems logging into RHEL servers with their AD credentials.
Long story short - we rolled out Likewise open which allowed us to make all of our RHEL3/4/5 servers join our Active Directory domain with a very high success rate.
However, now we have a handful of systems residing in the DMZ that are experiencing intermittent problems authenticating users, whether they are local accounts like root or network accounts from AD. The servers will respond to ping but we cannot SSH to them or even log in from the console. This happens every other day and the only fix we have so far is to reboot the system, only to see the problem return within a short amount of time.
When I look in the /var/log/secure log file, I see the following error appear:
sshd: error: Bind to port 22 on 0.0.0.0 failed: Address already in use.
After searching thru the almighty google - I see references to ipv6 being the culprit, but I have gone thru all of the steps to disable ipv6 and the problem still persists.
Does anyone have any experience with this kind of problem?