linux - 502 Bad Gateway HAproxy -


i have ubuntu 12.04lts running. webserver tomcat 7.0.42 , use haproxy proxy server. application servlet application uses websockets.

sometime when request page "502 bad gateway" error on resources not on all, on some. think has haproxy configuration, following: 

global     maxconn     4096 # total max connections. dependent on ulimit     nbproc      1  defaults     mode        http     option  http-server-close     option httpclose #   option  redispatch     no option checkcache  # test against 502 error  frontend 0.0.0.0:80     timeout client 86400000     default_backend www_backend     acl is_websocket hdr(upgrade) -i websocket     acl is_websocket hdr_beg(host) -i ws      use_backend socket_backend if is_websocket      backend www_backend         balance roundrobin         option forwardfor # sets x-forwarded-for         timeout server 30000         timeout connect 4000         server apiserver localhost:8080 weight 1 maxconn 1024 check      backend socket_backend         balance roundrobin         option forwardfor # sets x-forwarded-for         timeout queue 5000         timeout server 86400000         timeout connect 86400000         server apiserver localhost:8080 weight 1 maxconn 1024 check

what have change prevent 502 error?

first, enable haproxy logging. tell why giving 502's. guess backend "localhost:8080" not able keep or not able connection within 4000ms "timeout connect 4000".


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