Hi, The Ping service in Nagios has "unknown" status which was previously OK, this happens after i messed up some of the files owner and accidentally change it to Apache. Although I restored most of the file permission back to Root, the problem above still appears which I suspect is due to permission. Does anybody have idea where to look at. Thanks, junji aisalen.wordpress.com Linux Registered User #253162 CentOS User New Email names for you! Get the Email name you've always wanted on the new @ymail and @rocketmail. Hurry before someone else does! http://mail.promotions.yahoo.com/newdomains/aa/