Unable to reach Web UI

Hi all!
I’m barely new to Rancher, I’ve installed it on Docker using the Techno Tim YouTube guide.
Everything works just fine for some times.
Now I’m unable to reach the Rancher Web UI, but all of the pods I’ve created works perfectly.
What can I do?
Thank you very much!

You need to share more details about your setup. The number of possible reasons is unimaginable.

Thank you very much!
I’m running Rancher version 2.5.x (not sure exactly what version) on Docker.
I think that after some updates it changed some configuration because I can still use my Plex, Heimdall and piHole pod but I cannot reach the rancher web UI.
I’ve tryed to reinstall Rancher but now I have installed version 2.6.2 and I cannot find my old Pods.
I really don’t know what to do… maybe the easiest thing is to reinstall everything…