How do I make Nginx reverse proxy work?

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The original was posted on /r/selfhosted by /u/Anejey on 2023-08-06 17:12:45.

Hello,

I'm trying to set up Nging proxy manager to get rid of having to use different ports for all my services constantly, and also to be able to use Pihole local DNS. But I'm absolutely clueless as to how to do it. I'm reading guides, but I'm always confused at the end. It seems like every person is assuming I have 10 years of experience already.

I have NPM installed in a separate container on Proxmox. I have the gui open. I click on add proxy host, I put in the ip "192.168.0.213" as the domain, I set it to forward to "192.168.0.213:9091" on http. Nothing happens. I try adding the proxy to my internet settings. Now everything hosted locally forwards to NPM login screen. Why? How? What?

I just don't understand how it's supposed to work. If I google the problem I get page long configs I'm supposed to paste somewhere. I thought the whole meaning of the gui was to set it up from there?

I have Caddy (also a reverse proxy) running on my VPS to be able to use Plex and Jellyfin from my domain, and it works perfectly. But when it comes to doing it locally I'm just clueless.

Any advice is appreciated.