mod_perl server doesn't reply

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We are using a setup with a "light-weight" apache in front of the
mod_perl server.

Lately we have seen some problems with the mod_perl server. From time to
time it stops responding to the requests from the front end. The problem
seems to be related to the mod_perl server only since wget-ing on the
localhost:port doesn't work either.

Script with small or no output do work however. The server is also able
to handle 404's and server-status.

To debug I have tried to splitting the mod_perl the url space handled by
mod_perl into 3 parts and creating 3 separate servers to handle these
parts. 

The problem occurred again on all 3 servers at the same time. This has
led me to believe that the problem might be related to the operating
system. Perhaps some resource that is being overused. I am out of ideas
however.

Hope this list can help.

Thanks in advance.
  Anders Nielsen