HAProxy in front of Apache Proxy

[netgate_user_2024]

Hello.
We use HAProxy for several servers.
I have it configured to forward traffic on both port 80 and 443 and the servers handle the certificates.

Recently I added another server which uses an Apache proxy to a service on port 3000. (Zammad Server)

It is working but I cannot figure out how to forward the client IP addresses to the end service.

I read about the Proxy Protocol but I'm not sure if that applies here or how to implement it (without effecting the other existing server connections).

Any advice is appreciated.

[netgate_user_2024]

Okay I found the solution.

In HAProxy backend for the server that is affected you set:

send-proxy

In the "Per server pass thru" box under Advanced Settings.

Then in your Apache site config you have to include:

RemoteIPProxyProtocol On

As well as enabling the mod_remoteip module.

Hopefully this is helpful to anyone else finding themselves with this type of configuration.