Networking – Jupyter notebook does not open – General solutions do not work

When I try to open my Jupyter notebook, the following error message appears again and again.

Can not bind to localhost if 127.0.0.1 is used as the default IP
[Errno 49] The requested address can not be assigned

After the online search, the most common solution is to start the notebook with the following command:

jupyter notebook –ip = 127.0.0.1

However, if I try this, an error message will still be displayed

[Errno 49] The requested address can not be assigned

I think it's a kind of network configuration issue, but I'm not sure where to start looking for it. I checked mine etc / host File and it looks like it was never manipulated. Again, I'm not sure where to look otherwise, so any help is appreciated.

I have a MacBook Pro 2011 running 10.13.3.