Description:
------------
We got 5.2.2 in win2k3SP2/IIS6 32 Bit.
PHP installed as ISAPI extension, not filter.
Many concurrent application pools.

The problem seems to go away when all webs run in the same application pool (No multithreading/multiionstanceing). It also occours when there is only 1 pool with more than one worker (webgarden-configuration). So there is a point to start.

It's not a real workaround for us, because in the huge production
environment we run, we need to separate the application in safe pools.

Reproduce code:
---------------
Any PHP application, as long as many run simultaneously on different worker instances. Examples: PHPMyAdmin, Mediawiki, Mantis, ...

Expected result:
----------------
Standard output of the Applications

Actual result:
--------------
No content returned, but
either something like this in the win application eventlog:

Event Type:	Information
Event Source:	Application Error
Event Category:	(100)
Event ID:	1004
Date:		23.05.2007
Time:		11:09:44
User:		N/A
Computer:	P-NG-W3PHP2
Description:
Reporting queued error: faulting application w3wp.exe, version
6.0.3790.3959, faulting module php5isapi.dll, version 5.2.2.2, fault
address 0x000023d7.

or, more often, this in the system event log:

Event Type:	Warning
Event Source:	W3SVC
Event Category:	None
Event ID:	1011
Date:		23.05.2007
Time:		11:40:40
User:		N/A
Computer:	P-NG-W3PHP2
Description:
A process serving application pool 'PHP Sammelpool' suffered a fatal communication error with the World Wide Web Publishing Service. The process id was '404'. The data field contains the error number.