active connection counter always increased (nginx 0.8.54)

[leolance]

i have 4 nginx and the same configuration use lvs dr load balance, two of them have this problem:
Active connections: 4476 
server accepts handled requests
 27097803 27097803 27064329 
Reading: 1959 Writing: 2517 Waiting: 0 
# netstat -an | wc -l
459

and the normal server:
Active connections: 8 
server accepts handled requests
 58386943 58386943 58312509 
Reading: 2 Writing: 6 Waiting: 0
# netstat -an | wc -l
1104

These two error server have the same kernel version:
Linux abc.com 2.6.9-78.ELsmp #1 SMP Wed Jul 9 15:46:26 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux

I do not know where it went wrong.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,182264,184016#msg-184016