Server Down, But responding to PING

Hi,

Last few days my server goes down.

All services (ssh, httpd, smtp) goes down. But server is responding to PING.

How it respond to PING if server is crashed ? Is it normal ?

After getting reboot through DC, i checked "last", but it won't say server crashed.

What should i check to find reason for server going down like this ?

Regards,

Yujin

 

 

 

 

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