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I just check my logs on my deed serv, i spotted some weird log in the auth.log :

Jun 17 22:27:01 mutualab CRON[16249]: pam_unix(cron:session): session opened for user user by (uid=0)
Jun 17 22:27:01 mutualab CRON[16249]: pam_unix(cron:session): session closed for user user
Jun 17 22:28:01 mutualab CRON[16253]: pam_unix(cron:session): session opened for user user by (uid=0)
Jun 17 22:28:01 mutualab CRON[16253]: pam_unix(cron:session): session closed for user alain
Jun 17 22:29:01 mutualab CRON[16257]: pam_unix(cron:session): session opened for user user by (uid=0)
Jun 17 22:29:01 mutualab CRON[16257]: pam_unix(cron:session): session closed for user user

Looks like somebody try to log - and suceed ? - but delog instantly ? I got the same log for hours now...

Do you know what happens ?

N.B : it's a 10.04 ubuntu server

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up vote 9 down vote accepted

That's just cron running the cronjobs. It opens (and then closes) a PAM session for the appropriate user when it executes commands. Based on the timestamps, you have a cronjob which executes every minute.

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