lslb - ExtConn timed out while connecting.

[Clockwork]

My lslb error.log is getting flooded by the following notice:

2010-08-11 15:10:42.000 NOTICE [xxx] ExtConn timed out while connecting.

the site is working fine, but what does this message mean?

edit:

debug stuff:

2010-08-11 18:02:55.000 NOTICE [ip:52299-21#sitename:loadbalancer] ExtConn timed out while connecting.
2010-08-11 18:02:55.000 DEBUG [ip:52299-21#sitename:loadbalancer] connection to [192.168.0.3:80] on request #1, error: Connection timed out!
2010-08-11 18:02:55.000 DEBUG [ip:52299-21#sitename:loadbalancer] [ExtConn] close()
2010-08-11 18:02:55.000 DEBUG [ip:52299-21#sitename:loadbalancer] HttpExtConnector::tryRecover()...
2010-08-11 18:02:55.000 DEBUG [ip:52299-21#sitename:loadbalancer] trying to recover from connection problem, attempt: #1!
2010-08-11 18:02:55.000 DEBUG [ip:52299-21#sitename:loadbalancer] Get SESSION_ID from COOKIE: [hash].
2010-08-11 18:02:55.000 DEBUG [ip:52299-21#sitename:loadbalancer] Found worker [clusterHTTP_s2] by strategy [0].
2010-08-11 18:02:55.000 DEBUG [ip:52299-21#sitename:loadbalancer] [LB] retry worker: [clusterHTTP_s2]
2010-08-11 18:02:55.000 DEBUG [ip:52299-21#sitename:loadbalancer] trying to recover from connection problem, attempt: #1!
2010-08-11 18:02:55.000 DEBUG [192.168.0.4:80] connection available!
2010-08-11 18:02:55.000 DEBUG [192.168.0.4:80] request [ip:52299-21#sitename:loadbalancer] is assigned with connection!
2010-08-11 18:02:55.000 DEBUG [ip:52299-21#sitename:loadbalancer] [ExtConn] reconnect()
2010-08-11 18:02:55.000 DEBUG [ip:52299-21#sitename:loadbalancer] [ExtConn] connecting to [192.168.0.4:80]...

edit:

sometimes I'm getting the following warning:

2010-08-11 19:09:05.000 NOTICE [clusterHTTP_s4] PingConn timed out while connecting.
2010-08-11 19:09:05.000 WARN [192.168.0.5:80] Failure detected: Connection Failure, 110:Connection timed out
2010-08-11 19:09:05.000 NOTICE [clusterHTTP_s2] PingConn timed out while connecting.
2010-08-11 19:09:05.000 WARN [192.168.0.4:80] Failure detected: Connection Failure, 110:Connection timed out
2010-08-11 19:09:05.899 INFO [192.168.0.4:80] Fail all outstanding requests!
2010-08-11 19:09:05.899 INFO [192.168.0.4:80] Fail all outstanding requests!
2010-08-11 19:09:06.000 NOTICE [ip:1612-0#sitename] ExtConn timed out while connecting.
2010-08-11 19:09:06.000 INFO [192.168.0.5:80] Fail all outstanding requests!

the problem started after we've changed the connection from our database server to a gigabit port, but this change doesn't affected the loadbalancer or webserver, it just improved the page load speed.

btw. we had the "ExtConn timed out while connecting." notice sometimes before, but not that much like now.

edit:

nginx seems to loadbalance without any problems, so this seems to be a lslb problem