Hi, After running up2date to update many packages, my fc3 linux system log shows a lot of messages: ... Mar 4 10:20:01 pippo crond(pam_unix)[10178]: session opened for user root by (uid=0) Mar 4 10:20:01 pippo crond(pam_unix)[10178]: session closed for user root Mar 4 10:30:01 pippo crond(pam_unix)[10181]: session opened for user root by (uid=0) Mar 4 10:30:01 pippo crond(pam_unix)[10181]: session closed for user root Mar 4 10:40:01 pippo crond(pam_unix)[10184]: session opened for user root by (uid=0) Mar 4 10:40:01 pippo crond(pam_unix)[10184]: session closed for user root Mar 4 10:50:01 pippo crond(pam_unix)[10187]: session opened for user root by (uid=0) Mar 4 10:50:01 pippo crond(pam_unix)[10187]: session closed for user root ... What does that mean? What's wrong and how to fix it? Thanks for any help! Hongwei Li