What is the problem?
- I can no longer start the web interface after turning my PI off and on again
 - I can connect over SSH
 
    Access OctoPrint from a web browser on your network by navigating to any of:
    
    http://octopi.local
    http://192.168.1.232
    http://192.168.1.235
    http://[AN IPV6 ADDRESS]
    http://[AN IPV6 ADDRESS]
If I try any of the connection options though a browser I get a "Refused to connect - ERR_CONNECTION_REFUSED" error.
What did you already try to solve it?
- Restarting
 - Reconnecting to the WiFi
 - GitHub - OutsourcedGuru/octoprint-name-resolution-hacks: Working around name-resolution problems for your OctoPrint-based 3D printer
 
Have you tried running in safe mode?
No
Did running in safe mode solve the problem?
n/a
Systeminfo Bundle
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
Tried to run octoprint systeminfo but I get the error
pi@octopi:~ $ octoprint systeminfo
-bash: octoprint: command not found
Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
OctoPrint version : 1.7.3
OctoPi version    : 0.18.0