HAProxy - 503 Server Unavailable

[mauro]

Dear all,I'm new to the whole reverse proxy scene and this can be one possible reason of not getting things working.
At the same time I'm trying to follow tutorials and video getting anywhere.

I run OPNsense OPNsense 23.1.6-amd64 on an APU2C4 machine with PPPOEconnection over a modem

I've a webserver I need to be online and I'm using at the moment port forwarding PPPOE:80,443 -> DMZ:80,443. Let say I'm testing test.example.com (which is available from outside).  The apache config doesn't redirect port 80 ->443 because I'm trying to keep things simple

At the moment I'm trying to create a reverse proxy using as frontend IP LAN Address.
So far I only manage to receive

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503 Service Unavailable
No server is available to handle this request
I tried  port 80 and 81 for the frontend, same result

I followed the documentation about HAProxy and below few lines from the log

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[03/May/2023:17:10:43.527] test test/<NOSRV> -1/-1/-1/-1/0 400 0 - - PR-- 1/1/0/0/0 0/0 "<BADREQ>
[03/May/2023:17:11:13.163] test test/<NOSRV> -1/-1/-1/-1/0 503 217 - - SC-- 1/1/0/0/0 0/0 "GET / HTTP/1.1"
[03/May/2023:17:11:13.190] test test/<NOSRV> -1/-1/-1/-1/0 503 217 - - SC-- 1/1/0/0/0 0/0 "GET /favicon.ico HTTP/1.1"

I'm trying to test reverse proxy locally before move from port forwarding to reverse proxy.

I'm more then happy to share more information but I can't see which are the most relevant.

Any advice?

Thanks