[Python] Unable to start Kernel ... due to a timeout waiting for the ports to get used

Today I was running my python script in my jupyter notebook in vscode. At some point the program crashed. Afterwards I was not able to run the notebook at all since I always get this error: Failed to start the Kernel. Unable to start Kernel ... due to a timeout waiting for the ports to get used.

I already reinstalled jupyter, notebook and vscode. But I have no idea what I can do now.

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