What is the problem?
Cant access to the website using the default port :5000
What did you already try to solve it?
Seems that the only way to access to the website is to used a haproxy -> opening a port and set backend to localhost:5000 (using the ip dont work)
Have you tried running in safe mode?
Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible