Why does php exit after 6 minutes?

* CONFIG: PHP version 4.3.4 IIS version 6.0 MS SQL server 2000 Windows 2003 server - dual Pentium phpinfo(): safe_mode: off phpinfo(): max_execution_time: 1800s phpinfo(): mssql.timeout: 1800s IIS: website script execution time: f.a.p.p. unlimited IIS: website sessions: keep alive. RDBMS: query execution time: unlimited * WHAT HAPPENED: while running a long running query php.exe is visible in the task manager for 6 minutes, then it dies with out telling anything - what so ever! * DISCUSSION: This query works just fine if the query process data quickly, let say in about 30 to 60 seconds, but when the query needs to be processing data for ~25 minutes, php will exits after six minutes and then the database seams then to be doing a rollback for the next 20 minutes or so on the transactions made by the php connection. Before php exits the RDBMS responds normal - but has a CPU load of 100%. After php exits the RDBMS does not respond any more or respond very sluggish. I can see no kind of I/O activities with the RDBMS, only 100% CPU load. The RDBMS keeps in this state for about 20-30 minutes, then the RDBMS goes back to normal operation again. Any suggestion on what might be going on here is welcome. -- To readers of SYP@yahoogroups.com: Ursakta engelskan.