help troubleshooting? possible dos attack

I'm having problems on one of my servers.

Every now and then apache will fail to serve pages. Yet the service itself is not actually failing.

A simple restart in shell corrects the problem for awhile. It's not failing around any certain intervals though.

I've cheked the apache access and error logs - nothing seems abnormal. Also took a look at /var/log/messages - seems ok.

The server load is always normal around 0.5.

Ideas?

 

 

 

 

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