Need help understanding log
 

Can you help me figure out what exactly this means?

2013-01-30 04:04:50.082 [INFO] [46.165.195.x:35494-0#APVH_domain.com] Connection idle time: 121 while in state: 5 watching for event: 25,close!
2013-01-30 04:04:50.082 [NOTICE] [46.165.195.x:35494-0#APVH_domain.com] Content len: 0, Request line: 'GET / HTTP/1.1'
2013-01-30 04:04:50.082 [INFO] [46.165.195.x:35494-0#APVH_domain.com] HttpExtConnector state: 8, request body sent: 0, response body size: 0, response body sent:0, left in buffer: 0, attempts: 0.
2013-01-30 04:04:50.082 [INFO] [46.165.195.x:35494-0#APVH_domain.com] Lsapi connection state: 2, watching event: 25, respState: 1, m_iTotalPending:0, m_iPacketLeft:0, m_iCurRespHeader:0, req sent for 121 seconds,Total processing time: 121.
2013-01-30 04:04:50.082 [INFO] [46.165.195.xx:35494-0#APVH_domain.com] File not found [/home/username/domain.com/500.shtml]
2013-01-30 04:04:50.448 [INFO] [95.211.217.x:56735-0#APVH_domain.com] Connection idle time: 121 while in state: 5 watching for event: 25,close!
2013-01-30 04:04:50.448 [NOTICE] [95.211.217.xx:56735-0#APVH_domain.com] Content len: 0, Request line: 'GET / HTTP/1.1'
2013-01-30 04:04:50.448 [INFO] [95.211.217.xx:56735-0#APVH_domain.com] HttpExtConnector state: 8, request body sent: 0, response body size: 0, response body sent:0, left in buffer: 0, attempts: 0.
2013-01-30 04:04:50.448 [INFO] [95.211.217.xx:56735-0#APVH_domain.com] Lsapi connection state: 2, watching event: 25, respState: 1, m_iTotalPending:0, m_iPacketLeft:0, m_iCurRespHeader:8, req sent for 121 seconds,Total processing time: 121.
2013-01-30 04:04:50.448 [INFO] [95.211.217.xx:56735-0#APVH_domain.com] File not found [/home/username/domain.com/500.shtml]

these requests are timed out.
increase Connection Timeout (secs) (http://www.litespeedtech.com/docs/we...g/#connTimeout)

It's set at 120 seconds, isn't that enough?

it depends. if your external app (php) takes a longer time to finish, you need to increase it (say 300) to avoid timeout.