"Unable to connect to the local runtime" in google colab - jupyter-notebook

Question

I'm trying to connect local run time but it's not connecting,
I used the troubleshooting dialog following commands:
pip install jupyter_http_over_ws
jupyter serverextension enable --py jupyter_http_over_ws
jupyter notebook \ --NotebookApp.allow_origin='https://colab.research.google.com --port=8888 \--NotebookApp.port_retries=0
Have tried the same above steps as said in below URL
https://research.google.com/colaboratory/local-runtimes.html
Facing an issue 'Jupyter authentication cookie was not detected'
Tried by disabling adblocker, antivirus and also using different port numbers. Below was the solution given by team
Navigate to http://localhost:8888 in a separate browser tab and follow the provided instructions. This will set a browser cookie used for authentication between the browser and the Jupyter notebook server.
But when I open the URL, it asks for a password(already set up) and then no further instructions are appearing.

Answer 1

This issue was raised in Github issues for Collaboratory:
This answer helped me https://github.com/googlecolab/jupyter_http_over_ws/issues/1#issuecomment-557469128
According to this issue
start the jupyter notebook with the below command.
jupyter notebook --NotebookApp.allow_origin='https://colab.research.google.com' --NotebookApp.port_retries=0 --notebook-dir="" --no-browser --allow-root --NotebookApp.token='' --NotebookApp.disable_check_xsrf=True --port=8888
then open the notebook by going to this URL.
localhost:8888
according to kris This may allow you to connect, but it basically disables all security features.
Then retry connecting to local runtime with Google Colab
If it does not solve your problem then try disabling AdBlock extension or app.

Answer 2

For Windows (10/11)
Method 1: Using git bash
follow these steps
https://research.google.com/colaboratory/local-runtimes.html
Method 2: Using Windows terminal & Multiline commands
Install jupyter_http_over_ws
pip install jupyter_http_over_ws
enable the jupyter_http_over_ws jupyter extension (one-time)
jupyter serverextension enable --py jupyter_http_over_ws
Use multiline commands to start server and authenticate
jupyter notebook ^
--NotebookApp.allow_origin='https://colab.research.google.com' ^
--port=8888 ^
--NotebookApp.port_retries=0
Method 3: Using single-line command & windows terminal
Install jupyter_http_over_ws
pip install jupyter_http_over_ws
enable the jupyter_http_over_ws jupyter extension (one-time)
jupyter serverextension enable --py jupyter_http_over_ws
Use single-line commands to start server and authenticate
jupyter notebook --NotebookApp.allow_origin='https://colab.research.google.com' --port=8888 --NotebookApp.port_retries=0
Once the server has started, it will print a message with the initial backend URL used for authentication. Make a copy of this URL as you'll need to provide this in the next step.
Connect to the local runtime
In Colaboratory, click the "Connect" button and select "Connect to local runtime...". Enter the URL from the previous step in the dialog that appears and click the "Connect" button. After this, you should now be connected to your local runtime.

Answer 3

There are several reasons why a local connection might fail. To gather more diagnosis information, click the 'troubleshoot' link in the notification that appears in the lower left of the screen.
It will look like this:
I'd recommend following whatever steps are recommended there. If you get stuck, please update your original question with the diagnosis offered in the troubleshooting dialog.