haproxy 1.5-dev21 stopped forwarding traffic

[Xu (Simon) Chen]

I am using 1.5-dev21-6b07bf7. The haproxy process was running, the web gui
was responding. According to the web gui, all the backends were up, and I
restarted all backend services to make sure as well.

When I send connections to the front-end, TCP connection was established to
haproxy, and then stuck - clearly not forwarded to the backend servers.
After restarting haproxy everything started to work again. I needed to get
everything back online, so I couldn't collect more information, but the
configuration is here:

global
    log 127.0.0.1   local0
    log 127.0.0.1   local1 notice
    maxconn 1024
    user haproxy
    group haproxy
    daemon
    stats socket /var/run/haproxy.socket

defaults
    log     global
    mode    http
    option  tcplog
    option  dontlognull
    retries 3
    option redispatch
    maxconn 1024
    timeout connect 5s
    timeout client 25s
    timeout server 25s
    timeout tunnel 3600s
    timeout http-keep-alive 1s
    timeout http-request 15s
    timeout queue 30s
    timeout tarpit 60s
    default-server inter 3s rise 2 fall 3
    option forwardfor
    option http-server-close

listen service <ip>:443
    mode tcp
    option tcpka
    balance roundrobin
    server be1:443 be1:443 check weight 1
    server be2:443 be2:443 check weight 1
    server be3:443 be3:443 check weight 1


Any ideas? Thanks!