SOLVED WebUI not accessible anymore, no middleware service

[NicJak]

I had a power blackout and ever since, it seems that the server itself is running fine (it reported the unexpected shutdown via mail, all applicatoins are up). Luckily I am still able to connect via SSH. Entering service middleware restart prompted:
"Failed to restart middleware.service: Unit middleware.service not found."

How can I proceed?

 

[NicJak]

Figured it out:
My SSL Certificate expired some weeks ago, yet the WebUI continued working and listening on both ports, 80 and 443. Upon reboot, the WebUI failed to expose port 443. I connected to port 80 and updated my certificate settings.

Maybe a nginx redirect might be a more apt error handliing. Or the continued use of the expired certificate.