Request Timeout or Worker Process error?

Hi,
we are testing a new site on a hosting server.
When we launch an indexing process that takes some minutes to respond, after about 120/130 seconds the page goes timeout .
We tried setting "httpruntime executionTimeout = 3600" in web.config but nothing changed.
To be noted that the same process, on a limited set of data, runs without problems.
The very strange thing is that it seems that also the worker process (w3wp)restarts as all logged users have to login again; no any error is raised.
Can you please suggest what is happening?
Thanks.
Regards.

 

The application pool is recycling. That will happen after 20 minutes of inactivity or if your process is using more memory (100mb/IIS6, 200mb/IIS7) or CPU percentage than is allowed over a specific amount of time.

The CPU limit is pretty high and it shouldn't cause a recycle until 3.5 or 5 minutes (IIS6/IIS7), so I would guess you are running into the memory limit.

Check with support and they may be able to tell you why it's recycling.