Connection refused problem

[wangbin579]

all servers are running and nginx has the following error log every once
in a while.

2010/07/27 08:37:57 [error] 1948#0: *429632943 connect() failed (111:
Connection refused) while connecting to upstream, client:
125.45.229.167, server: xx.xxx.xxx, request: "GET xxxx HTTP/1.1",
upstream: "server://xx.xxx.xxx.xxx:xxxxx", host: "xxx.xxx.xxx",
referrer: "xxx"


Is the listen queue full ?what causes the above problem?
thx

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,113710,113710#msg-113710