Connection Failed: failed to connect to kernel when set up in a remote server (websocket related) · Issue #4757 · jupyter/notebook · GitHub
a connection to the notebook server could not be established. the notebook will continue trying to reconnect. check your network connection or notebook server configuration. · Issue #5149 · jupyter/notebook · GitHub
anaconda - how do I solve Kernel Connection issues with Jupyter Notebook for Windows - Stack Overflow
A Connection to the Notebook Server could not be established | Can't connect Jupyter Notebook server - YouTube
Websocket connection failed - Notebook - Jupyter Community Forum
google cloud ml - 'Server Connection Error' on GCP (AI Platform Notebook) - Stack Overflow
A connection to the notebook server could not be established. The notebook will continue trying to reconnect. Check your network connection or notebook server configuration. · Issue #4630 · jupyter/notebook · GitHub