Had these errors recently on the exodus and genesis servers – been a lot of recent work on these…
pam_access(crond:account): access denied for user `someuser' from `cron' crond[9985]: CRON (someuser) ERROR: failed to open PAM security session: Success crond[9985]: CRON (someuser) ERROR: cannot set security context
This link solved it:
http://hostechs.com/2008/07/cron-error-failed-to-open-pam-security-session/
* /etc/cron.allow – add users to this file
* /etc/security/access.conf – comment out
# All other users should be denied to get access from all sources. #- : ALL : ALL # -:ALL EXCEPT root:LOCAL
