After reading http://www.haproxy.org/download/1.5/doc/configuration.txt carefully, It seems I misinterpreted the situation.
The messages like "<NOSRV> 0/-1/-1/-1/0 503 212 - - SC-- 2/0/0/0/0 0/0" look not related to the timed out connections, but probably to the connections limits exceeded for the apache proces, a cite:
1) "the connection to the server failed ('SC--')"
2) It is possible that the server refused the connection because of too many already established
After reading http:// www.haproxy. org/download/ 1.5/doc/ configuration. txt carefully, It seems I misinterpreted the situation.
The messages like "<NOSRV> 0/-1/-1/-1/0 503 212 - - SC-- 2/0/0/0/0 0/0" look not related to the timed out connections, but probably to the connections limits exceeded for the apache proces, a cite:
1) "the connection to the server failed ('SC--')"
2) It is possible that the server refused the connection because of too many already established