Network Is Often Gone - Why?

The box is up, as I was told from the DC, but network is gone - No Ping, No HTTP, No SSH. Once they reboot the box, everything is fine.

What could cause that? I run both chkrootkit and rkhunter, found nothing.

From Apache logs and /var/log/messages, found no weired signs.

How do I tell if it is a network card failure, hard drive failue? Is it possible for me to see them from the log files?

 

 

 

 

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