Pi-Hole running but no web service

[Aidanrfraser]

Hi all,
Running into an issue where pi-hole is working and blocking ads on my network, but the web service is inaccessible. I can't seem to find a topic like this, so I'm starting a new one.

I'm on a 64-bit raspberry pi 4b 4gb that's running pi os lite (no GUI) with casaOS on top. I first tried to use casaOS's docker container feature to automatically install an instance of pi-hole. I had web connectivity, but the DNS wasn't resolving (-2 domains blocked), even after triple checking my router's DNS settings.
So I went to install it on the system myself. I got it to install, but whenever I visit the IP or pi.hole/admin it returns a 404 error.

Here's my debug token, if someone could help me out it would be greatly appreciated.

[rdwebdesign]

There is another process using port 80:

[✗] tcp:*:80 is in use by casaos-gateway (https://docs.pi-hole.net/main/prerequisites/#ports)

This is the default port used by Pi-hole's web server (lighttpd).
You can't run both services on the same port. You need to change one of them to a different port (Example: 8080).

You can change the port used by casaOS to 8080 (you will need to check casaOS documentation).

Or...

You can change the port used by Pi-hole on the lighttpd configuration.

[Aidanrfraser]

Wow that was easy. I'm new to this, so thanks for the help!