I ran into this issue after a storm knocked out our power and this is how I resolved it.
I thought this would be helpful in case someone else has this particular issue since it wasn’t already documented.
What I experienced:
- The Umbrel UI shows up via browser but there is no option to log in or log out.
- The Shutdown, Restart, and Troubleshoot buttons throw a connection error.
- I am able to SSH into the Raspberry Pi 4.
How I resolved it:
SSH into Raspberry Pi 4 and reboot using the following command
ssh -t umbrel@umbrel.local
sudo reboot
Good luck!
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Thanks! I was finally able to ssh into my umbrel using that command and did the reboot.
However… I have another problem now. When I go to umbrel.local I get a page that says the umbrel refuses to connect … and if I go to the IP address that I assigned to it in my router I get the umbrel start page that never loads. I figured it was offline, but now that I was able to ssh into the umbrel I’m able to ping out 
That could be a browser caching issue.
Try clearing out your cookies and open an incognito window.
If clearing the browser cache doesn’t work you might want to stop then restart the startup service
sudo systemctl stop umbrel-startup.service && docker system prune --force --all && sudo systemctl start umbrel-startup.service
