[users@httpd] Apache 2.0.52 - stops responding

[Travis Derouin <td...@gmail.com>]

Hi,

I'm running Apache 2.0.52, with resin 2.1.14 on a Windows 2003 server.
The past few days we've been running into a weird problem, I'm not
sure whether or not Apache is responsible. Every few hours (our site
gets about 70k visitors a day), all the Apache worker threads get used
up and the server comes to halt. Doing a netstat -an, there are a lot
of sockets that show up as being either in the CLOSE_WAIT, TIME_WAIT,
or FIN_WAIT2 state.

Example:

  TCP    69.20.122.206:80       165.155.160.139:62360  FIN_WAIT_2
  TCP    69.20.122.206:80       167.80.246.204:10384   TIME_WAIT
  TCP    69.20.122.206:80       167.80.246.204:10392   TIME_WAIT
  TCP    69.20.122.206:80       167.80.246.204:10401   TIME_WAIT
  TCP    69.20.122.206:80       24.69.255.205:9963     ESTABLISHED
  TCP    69.20.122.206:80       24.77.151.229:1743     CLOSE_WAIT
  TCP    69.20.122.206:80       24.78.22.115:4466      CLOSE_WAIT

When the process halts, of the 700 or so open connections to port 80,
500 of them are in one of these 3 states (400 are CLOSE_WAIT).

It's weird, everything was up and running for almost 3 months without
any problems, then since 9.29, apache comes to a complete halt every
few hours, depending on the traffic. We haven't run a windows update
since 9.15, so I doubt there's been anything new put on the machine
that's interefering with Apache. The worker threads seem to get used
up almost immediately before there's a crash, things will seem stable
according to the server status, with about 200 threads in use, then
it'll jump by a hundred per minute over the next few minutes until it
hits its max (at 1400) then everything stops working.

Could the hosting provider have changed some network configuration
that might interfere with our Apache process? We also had the same
issues with 2.0.49, and I upgraded to .52. We haven't made any
significant code changes in the past month that might be responsible
for something like this.

Any input would be appreciated! Thanks!!
Travis

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