VServer with HAProxy

Hi,

i rent 3 VServers each Server has his own Network.

is it possible to konfigure HAProxy with that?
If i Try my config in VMWorkstation in the Same network it works.
But not in the VServers.

its Look like this

global
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats timeout 30s
user haproxy
group haproxy
daemon

defaults
log global
mode http
option httplog
option dontlognull
timeout connect 5000
timeout client 50000
timeout server 50000

frontend http_front
bind *:80
mode http
stats uri /haproxy?stats
default_backend http_back

backend http_back
balance roundrobin
server server1 x.x.x.x:80 check
server server2 x.x.x.x:80 check

Thank You

Rob