[jerome]

Log:

2009-04-20 11:49:13.301 [INFO] [221.255.4.26:40611-0#APVH_test.com] Connection idle time: 31 while in state: 5 watching for event: 25,close!
2009-04-20 11:49:13.301 [NOTICE] [221.255.4.26:40611-0#APVH_test.com] Content len: 320, Request line:
(null)
2009-04-20 11:49:13.301 [INFO] [221.255.4.26:40611-0#APVH_test.com] HttpExtConnector state: 8, request body sent: 320, response body size: 0, response body sent:0, left in buffer: 4459, attempts: 0.
2009-04-20 11:49:13.301 [INFO] [221.255.4.26:40611-0#APVH_test.com] File not found [/home/test/public_html/408.shtml]
2009-04-20 11:49:13.301 [NOTICE] [Child: 26338] Shut down successfully!
2009-04-20 11:49:13.301 [NOTICE] [APVH_test_Suphp:] stop worker processes
2009-04-20 11:49:13.301 [INFO] Permission denied, let parent kill it: 26354
2009-04-20 11:49:13.301 [INFO] Permission denied, let parent kill it: 3607
2009-04-20 11:49:13.304 [NOTICE] [AutoRestarter] cleanup children processes and unix sockets belong to process 26338 !
2009-04-20 11:49:13.304 [INFO] [CLEANUP] Clean up child process with pid: 3607
2009-04-20 11:49:13.304 [INFO] [CLEANUP] Clean up child process with pid: 26354
2009-04-20 11:49:13.405 [NOTICE] [AutoRestarter] child process with pid=26338 exited with status=0!
2009-04-20 11:49:13.405 [NOTICE] [PID:26334] Server Stopped!

The shutdown was not initiated by any user on the server, and it occurred exactly when the 408 occurred.
Script problems aside (which shouldn't be), the server shouldn't go down because of it.