HAProxy Loadbalancing TCP traffic
<p>Using HAProxy, I'm trying to (TCP) load balance Rserve(a service listening in TCP socket for calling R scripts) running at port 6311 in 2 nodes.</p>

<p>Below is my config file. When I run HAProxy, its statting without any issues. But when I connect to the balanced nodes, getting below error. Anything wrong with the config? </p>

<p><code>Handshake failed: expected 32 bytes header, got -1</code></p>

<pre><code>#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
    log         127.0.0.1 local2

    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon

    # turn on stats unix socket
    stats socket /var/lib/haproxy/stats

#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
    mode                    tcp
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    #option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000


listen haproxy_rserve
        bind *:81
        mode tcp
        option tcplog
        timeout client  10800s
        timeout server  10800s
        balance leastconn
        server rserve1 rserveHostName1:6311
        server rserve2 rserveHostName2:6311

listen stats proxyHostName:8080
    mode http
    stats enable
    stats realm Haproxy\ Statistics 
    stats uri /haproxy_stats
    stats hide-version
    stats auth admin:password
</code></pre>

<p>Tried with below frontend-backend way of balancing as well. Same result. </p>

<pre><code>frontend haproxy_rserve
    bind *:81
    mode tcp
    option tcplog
    timeout client  10800s
    default_backend rserve

backend rserve
    mode tcp
    option tcplog
    balance leastconn
    timeout server  10800s  
    server rserve1 rserveHostName1:6311
    server rserve2 rserveHostName2:6311 
</code></pre>