On my debian-squeeze server I get thousands of messages in the logcheck email under
Security Events for sudo
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Aug 31 20:17:44 eclabs sudo: pam_limits(sudo:session): unknown limit item 'nofiles'
Aug 31 20:17:44 eclabs sudo: pam_limits(sudo:session): unknown limit item 'nofiles'
System Events
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Aug 31 18:45:01 eclabs CRON[31531]: pam_limits(cron:session): unknown limit item 'nofiles'
Aug 31 18:45:01 eclabs CRON[31531]: pam_limits(cron:session): unknown limit item 'nofiles'
Aug 31 18:45:01 eclabs CRON[31530]: pam_limits(cron:session): unknown limit item 'nofiles'
...
How can I understand these messages and what should I do? How do I find out in which log these lines appear?