logwatch weird issue

In my logwatch i see every day :

crond:
Unknown Entries:
session closed for user root: 393 Time(s)
session opened for user root by (uid=0): 393 Time(s)


In /var/log/messages these lines appear often :

May 7 09:00:01 smoke crond(pam_unix)[28412]: session closed for user root
May 7 09:00:06 smoke crond(pam_unix)[28411]: session closed for user root
May 7 09:01:01 smoke crond(pam_unix)[28425]: session opened for user root by (uid=0)
May 7 09:01:01 smoke crond(pam_unix)[28425]: session closed for user root
May 7 09:05:01 smoke crond(pam_unix)[28431]: session opened for user root by (uid=0)
May 7 09:05:01 smoke crond(pam_unix)[28431]: session closed for user root
May 7 09:10:01 smoke crond(pam_unix)[28438]: session opened for user root by (uid=0)
May 7 09:10:02 smoke crond(pam_unix)[28438]: session closed for user root
May 7 09:15:01 smoke crond(pam_unix)[28445]: session opened for user root by (uid=0)
May 7 09:15:01 smoke crond(pam_unix)[28445]: session closed for user root
May 7 09:20:01 smoke crond(pam_unix)[28453]: session opened for user root by (uid=0)
May 7 09:20:01 smoke crond(pam_unix)[28453]: session closed for user root
May 7 09:23:47 smoke sshd(pam_unix)[28655]: session opened for user peter by (uid=0)
May 7 09:23:51 smoke su(pam_unix)[28682]: session opened for user root by peter(uid=502)
May 7 09:25:01 smoke crond(pam_unix)[28721]: session opened for user root by (uid=0)
May 7 09:25:02 smoke crond(pam_unix)[28721]: session closed for user root
May 7 09:30:01 smoke crond(pam_unix)[28771]: session opened for user root by (uid=0)
May 7 09:30:01 smoke crond(pam_unix)[28771]: session closed for user root
May 7 09:35:01 smoke crond(pam_unix)[28818]: session opened for user root by (uid=0)
May 7 09:35:01 smoke crond(pam_unix)[28818]: session closed for user root


What is this , how to solve it.


Thanks in advance.

System running Centos 4.0

 

 

 

 

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