Apache intermittently stops accepting requests

Question

Apache HTTP Server

Apache stops accepting requests. It just hangs on the port and does not respond. Before it is nginx, which gives the static. Apache is only needed for mod_php. This happens periodically, it does not recover itself, it remains in this position until you restart it. What could be the reason, what to see, what to check?

Apache/2.2.12, Ubuntu 9.10.

The graph shows a dip in the processor and requests.

Answer 1

Isn't it?
https://issues.apache.org/bugzilla/show_bug.cgi?id=47645

Answer 2

>> What could be the reason, what to see, what to check?
What's in the logs?
What about memory? What's with the processor?
What is the load on the server?

Answer 3

We have a similar problem on one of the servers. With what is connected and not caught.

Answer 4

And what at this moment in apache status?