Hello!

After 20 hours of struggle, I'm trying to ask you for help.

My Goal:
Use Coolify + Gitea behind IIS Reverse Proxy.

Access Coolify at "http://coolify.example.com".
Access Gitea at "http://gitea.example.com".

Run HTTP initially before moving to HTTPS.

What I Did:
Installed Kubuntu 24.04 LTS.
Ran curl -fsSLhttps://cdn.coollabs.io/coolify/install.sh | sudo bash.
v4.0.0-beta.454
Accessed 127.0.0.1:8000 to use Coolify (the admin interface).
Added Gitea as a project and clicked "Deploy".

The part I'm unsure about (Domain Access):
I want to access Coolify and Gitea via a domain.

Coolify -> Settings -> Configuration -> General -> Domain =http://coolify.example.com
Coolify -> Settings -> Configuration -> General -> Instance's Public IPv4 = [MY-PUBLIC-IP]
Coolify -> Projects -> Gitea -> Configuration -> General -> Services -> Domains =http://gitea.example.com:3000

Since I use Microsoft IIS as the web server for my public websites, I don't want to disrupt my existing setup. I am trying to run Coolify behind IIS, using IIS as a Reverse Proxy.

IIS Reverse Proxy Setup:
Created a new website in IIS:

New site = example.com (http)
Installed ARR + Rewrite.

Created web.config (with help from ChatGPT & Gemini):

XML

<configuration>  <system.webServer>    <rewrite><rules>                <rule name="CATCH ALL PROXY TO COOLIFY" stopProcessing="true">                    <match url="(.*)" />                    <action type="Rewrite" url="http://192.168.1.142:80/{R:1}" />                    <serverVariables>                        <set name="HTTP_HOST" value="{HTTP_HOST}" />                        <set name="HTTP_X_FORWARDED_HOST" value="{HTTP_HOST}" />                        <set name="HTTP_X_FORWARDED_PROTO" value="http" />                        <set name="HTTP_X_FORWARDED_SCHEME" value="http" /><set name="HTTP_X_FORWARDED_FOR" value="{REMOTE_ADDR}" />                    </serverVariables>                </rule></rules>    </rewrite>  </system.webServer></configuration>

The Result:
When I try to visit:
http://coolify.example.com
http://gitea.example.com

I receive the response:
404 page not found (I think it is from Traefik).

If I turn off the Coolify proxy, I get an IIS error:

502 - Web server received an invalid response while acting as a gateway or proxy server.There is a problem with the page you are looking for, and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server.

My Questions:
Am I approaching this correctly?
Could the IIS Reverse Proxy be causing issues?
Have I missed anything in Coolify's configuration?
Am I fundamentally misunderstanding something?