@stephenw10
I agree with you.
How can testing what is the problem only leave this service, for example, i used to test proxmox.
Inside Services / HAProxy / Backend
Name: PM_8006
Mode: active
Name: pm
Forward to: Address+Port
Address: 192.168.100.3
Port: 8006
Encrypt(SSL): yes
SSL checks: yes
And in the Health check method set: basic
How i configure On the Frontend part.
Services / HAProxy / Frontend
Name: PM_Front
External address
Listen address: WAN address (IPv4)
Port: 8006
SSL Offloading: yes
In Access Control lists inside the same
Name: pm
Expression: Host matches
CS: empty
Note: empty
Value: pm.domain.com
In part Actions inside the same
Action Use Backend the name that i set on PM_8006
Condition acl names: the same name that i set in Access Control lists pm
And inside the same Additional certificates select SSL Offloading what i on System / Certificates / Certificates
The same certificate and added inside proxmox, because is letsencrypt wildcard certificate
And when i try to visit https://pm.domain.com:8006/ the result is like this below message.
503 Service Unavailable
No server is available to handle this request.