error 500 on a certain vHost

#1
Hi,

I get following error that leads to a "internal error 500" some times on a certail vHost:

Code:
2011-10-09 02:30:07.313 [INFO] [91.98.6.7:2001-0#APVH_www.domain.com] Connection idle time: 121 while in state: 5 watching for event: 24,close!
2011-10-09 02:30:07.313 [NOTICE] [91.98.6.7:2001-0#APVH_www.domain.com] Content len: 0, Request line: 'GET /upgrade.php?op=upgarde HTTP/1.1'
2011-10-09 02:30:07.313 [INFO] [91.98.6.7:2001-0#APVH_www.domain.com] Cookie len: 97, user=MzQzOTptYXNvdWRkYTozYzk0ZjZkNjkxZmYwNDNmMGQ4ZGQzNmY4MDBhNzE0ZjoxMDo6MDowOjA6MDo6NDA5Ng%3D%3D
2011-10-09 02:30:07.313 [INFO] [91.98.6.7:2001-0#APVH_www.domain.com] HttpExtConnector state: 8, request body sent: 0, response body size: 0, response body sent:0, left in buffer: 0, attempt
s: 0.
2011-10-09 02:30:11.669 [INFO] [188.121.147.105:53408-0#APVH_www.domain.com] Connection idle time: 121 while in state: 5 watching for event: 24,close!
2011-10-09 02:30:11.669 [NOTICE] [188.121.147.105:53408-0#APVH_www.domain.com] Content len: 4, Request line: 'POST /ajax.php?req=czinf HTTP/1.1'
2011-10-09 02:30:11.669 [INFO] [188.121.147.105:53408-0#APVH_www.domain.com] Cookie len: 284, __utma=253842960.1196473120.1312234443.1312234443.1312234443.1; __utmz=253842960.1312234443.1.1.
utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); user=MzYyOTphcG9maXo6ZGFkM2EzN2FhOWQ1MDY4OGI1MTU3Njk4YWNmZDdhZWU6MTA6OjA6MDowOjA6OjQwOTY%3D; acopendivids=bannertop; acgroupswithpersist=nada
2011-10-09 02:30:11.669 [INFO] [188.121.147.105:53408-0#APVH_www.domain.com] HttpExtConnector state: 8, request body sent: 4, response body size: 0, response body sent:0, left in buffer: 0,
attempts: 0.
2011-10-09 02:30:13.401 [INFO] [91.99.192.208:16161-0#APVH_www.domain.com] Connection idle time: 121 while in state: 5 watching for event: 24,close!
2011-10-09 02:30:13.401 [NOTICE] [91.99.192.208:16161-0#APVH_www.domain.com] Content len: 0, Request line: 'GET /MTForumsBlock.php?req=LastTopics&p=1 HTTP/1.1'
2011-10-09 02:30:13.401 [INFO] [91.99.192.208:16161-0#APVH_www.domain.com] Cookie len: 61, acopendivids=bannertop; acgroupswithpersist=nada; dle_newpm=0
2011-10-09 02:30:13.401 [INFO] [91.99.192.208:16161-0#APVH_www.domain.com] HttpExtConnector state: 8, request body sent: 0, response body size: 0, response body sent:0, left in buffer: 0, at
tempts: 0.
2011-10-09 02:30:13.402 [INFO] [188.159.134.97:1741-0#APVH_www.domain.com] Connection idle time: 121 while in state: 5 watching for event: 24,close!
2011-10-09 02:30:13.402 [NOTICE] [188.159.134.97:1741-0#APVH_www.domain.com] Content len: 4, Request line: 'POST /ajax.php?req=czinf HTTP/1.1'
2011-10-09 02:30:13.402 [INFO] [188.159.134.97:1741-0#APVH_www.domain.com] Cookie len: 141, user=MTAwNjI6c21zbnI6N2QwOTc3NWQ1ODY2ODc0ZDBkMThhMDA4ZjE4NmM3MzA6MTA6OjA6MDowOjA6OjQwOTY%3D; acope
ndivids=bannertop; acgroupswithpersist=nada
Please note that this is not a "permanent" issue, so it's a bit hard to be investigated,
Any ideas to resolve this ?
 
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