I have just resolved an issue that I thought someone else might run into
in the future, so I'm posting it to the list for future googlers.
Problem Symptoms:
* OTRS cron jobs are not executing, as a result no remote e-mail
fetching is occurring
* Manually running "Fetch Mail" from the admin interface functions
properly
* Manually executing "su -s /bin/sh -c
/opt/otrs/bin/otrs.PostMasterMailbox.pl otrs" as otrs user
functions properly
* Adding "opt/otrs/bin/otrs.PostMasterMailbox.pl >>/dev/null"
executes properly.
* /var/log/cron contains the following errors:
o crond[6551]: Permission denied
crond[6551]: CRON (otrs) ERROR: failed to open PAM security
session: Success
crond[6551]: CRON (otrs) ERROR: cannot set security context
System:
* CentOS 5.x/RedHat 5.x
* OTRS RPM install
* selinux permissive
* crond is running
Solution:
The cron.log error indicates that the problem is located somewhere
within the PAM stack, which is preventing crond from launching a shell
owned by the otrs user. The system in question is using
/etc/security/access.conf to limit login access to the server. (Useful
for limiting login access when the system uses some form of centralized
authentication.) Other required PAM modules may also interfere. In this
case adding a line to permit the otrs user login access via cron:
+ : otrs : cron crond
or less secure
+ : ALL : cron crond
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