Last updated on OCTOBER 17, 2013
Applies to:
Linux OS - Version Oracle Linux 5.6 to Oracle Linux 6.4 with Unbreakable Enterprise Kernel [2.6.39] [Release OL5U6 to OL6U4]Information in this document applies to any platform.
Symptoms
You cannot log into the system as a normal user, nor as root. All attempts such as using the Gnome Window Manager GDM screen or ssh(1) fail.
Gnome Display Manager (GDM)
Authentication Failed/var/log/messages
May 2 20:21:43 HOSTNAME gdm[6561]: Couldn't open session for root/var/log/secure
May 2 20:20:37 HOSTNAME sshd[7450]: Accepted password for xxxxxxx from ##.##.##.## port 1474 ssh2
May 2 20:20:37 HOSTNAME sshd[7450]: pam_unix(sshd:session): session opened for user xxxxxxx by (uid=##)
May 2 20:20:37 HOSTNAME sshd[7450]: error: PAM: pam_open_session(): Permission denied
May 2 20:20:37 HOSTNAME sshd[7454]: Received disconnect from ##.##.##.##: 2: disconnected by server requestChanges
The file /etc/security/limits.conf has recently been changed to set the number of files a process can have open (nofile) to the value "unlimited". For example, the original stanza:
* soft nofile 4096
* hard nofile 65536
* hard nofile 65536
was changed to be:
* soft nofile unlimited
* hard nofile unlimitedCause
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