Sporadic connection timeout problem in TCP mode

[pechspilz]

Hi,

I'm seeing a very sporadic issue (every few days) in a TCP mode proxy 
and I'm at loss what could be causing it.

After some time, haproxy is unable to establish a connection with the 
backend server. 20000 is the configured connect timeout. I can't see any 
exhausted resources in haproxy or on the frontend or backend server.

Jan 25 06:29:17 sugardaddy haproxy[14013]: 123.123.123.123:55698 
[25/Jan/2014:06:28:57.210] f1/server1 1/-1/20000 0 sC 999/7/7/7/0 0/0

Once this happens, every other connection attempt to this proxy will be 
met with the same timeout. Restarting haproxy instantly makes it all 
work again. Other frontend/backend proxy configurations running in the 
same haproxy instance are not affected, it just happens to one proxy.

I could be wrong but since the problem vanishes after restarting 
haproxy, I don't think it's an issue with the backend server. Restarting 
haproxy every hour "fixes" the problem but I'd prefer to keep haproxy 
running all day/night.

I tried the last 3 released 1.5 dev versions, it didn't make a 
difference.

Cheers