Server spawn problem

Attempt to connect to my Notebook and all-time get the error:

Spawn failed: Server at didn’t respond in 120 seconds

It began yesterday morning and was working perfectly before. I’ve read related topics, but unfortunately, it didn’t help.

The situation is changed. Now when I try to open my Notebook, I see an empty screen. No errors.

What is in the URL bar of your browser when you have the blank page?

The same URL.
But it works now. It’s magic!

Thank you a lot