Forwarding Incoming Ports Not Working

Help!
1

I’m working with HAProxy in Docker. I’m trying to set up HAProxy so that whatever the requested port is will be forwarded to the backend.

frontend main
    bind *:80
    bind *:8091-8096
    bind *:11200-11211
    bind *:18091-18096
    bind *:9102
    mode tcp

    acl is_couchbase hdr(host) -i couchbase.local

    use_backend couchbase_server if is_couchbase

frontend main_http
    bind *:15672
    mode http
    option httplog

    acl is_rabbit hdr(host) -i rabbit.local

    use_backend rabbit_server if is_rabbit

backend couchbase_server
    mode tcp
    server couchbase couchbase-server

backend rabbit_server
    mode http
    server rabbit rabbit

For example, I should be able to make a request to rabbit.local:15672 and get routed there. When I try to do this though, I’m just getting 503’s.

If I modify my config to be:

backend rabbit_server
    mode http
    server rabbit rabbit:15672

Now I can go to rabbit.local and it works.

Reading around here, I get the impression that my original config should be working, but it’s not.

Any ideas?