Solved the problem. I tried many things, and while the final thing may have fixed it, I’m not savvy enough to know if it “fixed” it.
In the Jupyter Config file, you change a ‘localhost’ to ‘0.0.0.0’
This is on the machine I’m connecting to:
nano ~/.jupyter/jupyter_notebook_config.py
c.NotebookApp.ip = '0.0.0.0' # Listens on all network interfaces
c.NotebookApp.open_browser = False
I ignored the above because I could have it run headless in the command, and sometimes wanted it to open in the browser.
c.NotebookApp.port = 8888 # Ensure the port matches your SSH forwarding
I then test ran Jupyter Notebook (after downgrading to 6.5.7) locally. It worked still!
When I tried it via a mobile hotspot to check the network connectivity, it still gave the error above. The way I got around it was to go to the address of ‘localhost:8888’ rather than one of the three links provided. I used the token to set up a password. I can now get it to consistently run.
I tried downgrading, which may have helped.
I tried Jupyter Lab, which did not help.
I tried connecting locally over SSH, and was successful, even initially. This was only occurring when trying to connect remotely.