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New to HAProxy - 503 Service unavailable No server is available to handle this request

Hi,

I’m new to HAProxy and need a little bit of help. I’m running a few things using docker and thus have decided to use HAProxy to forward some internal DNS records that I have created.

However I am getting 503 Service Unavailable No server is available to handle this request when trying to reach any of these addresses, they are all up and working when I connect using the IP address and port. Below is my haproxy.cfg if someone could point me in the right direction.

Thanks!

global
log 127.0.0.1 local2
maxconn 40000
user haproxy
group haproxy
deamon

defaults
mode tcp
log global
option http-server-close
option redispatch
retries 3
timeout connect 5000
timeout client 5000
timeout server 5000

frontend FRONT_END_DEFAULT
bind *:80
mode http
maxconn 10000

acl ACL_HUBLOCAL hdr_dom(host) -i hub.local
acl ACL_HOMEASSISTANT hdr_dom(host) -i homeassistant.local
acl ACL_PIHOLE hdr_dom(host) -i pihole.local

use_backend BACKEND_HUBLOCAL if ACL_HUBLOCAL
use_backend BACKEND_HOMEASSISTANT if ACL_HOMEASSISTANT
use_backend BACKEND_PIHOLE if ACL_PIHOLE

backend BACKEND_HUBLOCAL
balance roundrobin
mode http
server HUBLOCAL 192.168.0.250:81 observe layer7 check fall 3 rise 5 inter 2000 weight 10

backend BACKEND_HOMEASSISTANT
balance roundrobin
mode http
server HOMEASSISTANT 192.168.0.250:8123 observe layer7 check fall 3 rise 5 inter 2000 weight 10

backend BACKEND_PIHOLE
balance roundrobin
mode http
server PIHOLE 192.168.0.250:82 observe layer7 check fall 3 rise 5 inter 2000 weight 10