Jupyter server crashed. Unable to connect. Cannot assign requested address

Environment data

• VS Code version:

Version: 1.36.1
Commit: 2213894ea0415ee8c85c5eea0d0ff81ecc191529
Date: 2019-07-22T07:38:21.043Z
Electron: 4.2.8
Chrome: 69.0.3497.128
Node.js: 10.11.0
V8: 6.9.427.31-electron.0
OS: Linux x64 4.19.61-1-lts

• Extension version (available under the Extensions sidebar): 2019.6.24221 (9 July 2019)
• OS and version: Archlinux
• Python version (& distribution if applicable, e.g. Anaconda): py3.7
• Type of virtual environment used (N/A | venv | virtualenv | conda | …): conda
• Jedi or Language Server? (i.e. what is "python.jediEnabled" set to; more info microsoft/vscode-python#3977):

User belongs to experiment group 'ShowPlayIcon - runFile'
Starting Jedi Python language engine.
##########Linting Output - flake8##########

Steps

In a python file, having:

#%%
print("hi")

CTRL+enter to run

I’m not sure, but the issue may be that the jupter server wants to bind to something other than 127.0.0.1, which it would fail. I do have a global option set in ~/.jupyter/jupyter_notebook_config.py: c.NotebookApp.ip = '127.0.0.1', and w/o it (or without setting --ip, the jupyter notebook would fail on my machine. It may be the case that this estension is not reading that config file, but not sure.

Expected behaviour

CTRL+enter should start the jupyter server, and run the cell.

Actual behaviour

A notification shows: Jupyter server crashed. Unable to connect. Error code from jupyter: 1.

Logs

Output from Console under the Developer Tools panel (toggle Developer Tools on under Help; turn on source maps to make any tracebacks be useful by running Enable source map support for extension debugging)

[Extension Host] Info Python Extension: 2019-07-30 12:48:14: Cached data exists getEnvironmentVariables, <No Resource>
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:14: Getting jupyter server options ...
webviewElement.ts:363 [Embedded Page] %cElectron Security Warning (Insecure Content-Security-Policy)
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Request for onigasm file at /home/adrin/.vscode-oss/extensions/ms-python.python-2019.6.24221/out/client/node_modules/onigasm/lib/onigasm.wasm
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Searching for token colors ...
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Attempting search for colors ...
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Connecting to jupyter server ...
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Searching for token colors ...
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Attempting search for colors ...
2console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Loading colors from /usr/lib/code/extensions/theme-defaults/themes/dark_plus.json ...
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Connecting to history server
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Cached data exists getEnvironmentVariables, <No Resource>
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Launching history server
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Generating custom default config at /tmp/0beef754-8aaa-420c-8620-27143cf83436/jupyter_notebook_config.py
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Attempting search for colors ...
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Loading base colors from /usr/lib/code/extensions/theme-defaults/themes/dark_plus.json ...
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Attempting search for colors ...
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Loading base colors from /usr/lib/code/extensions/theme-defaults/themes/dark_plus.json ...
2console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Using colors to generate CSS ...
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:17: Cached data exists getEnvironmentVariables, <No Resource>
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:19: Request for tmlanguage file.
webviewElement.ts:363 [Embedded Page] Could not create web worker(s). Falling back to loading web worker code in main thread, which might cause UI freezes. Please see https://github.com/Microsoft/monaco-editor#faq
webviewElement.ts:363 [Embedded Page] Failed to construct 'Worker': Script at 'vscode-resource:/home/adrin/.vscode-oss/extensions/ms-python.python-2019.6.24221/out/datascience-ui/history-react/editor.worker.js' cannot be accessed from origin 'null'.
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:20: Traceback (most recent call last):  File "/home/adrin/miniconda3/envs/sklearn/bin/jupyter-notebook", line 10, in <module>
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:20:     sys.exit(main())  File "/home/adrin/miniconda3/envs/sklearn/lib/python3.7/site-packages/jupyter_core/application.py", line 267, in launch_instance    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)  File "/home/adrin/miniconda3/envs/sklearn/lib/python3.7/site-packages/traitlets/config/application.py", line 657, in launch_instance    app.initialize(argv)  File "</home/adrin/miniconda3/envs/sklearn/lib/python3.7/site-packages/decorator.py:decorator-gen-7>", line 2, in initialize
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:20:   File "/home/adrin/miniconda3/envs/sklearn/lib/python3.7/site-packages/traitlets/config/application.py", line 87, in catch_config_error    return method(app, *args, **kwargs)  File "/home/adrin/miniconda3/envs/sklearn/lib/python3.7/site-packages/notebook/notebookapp.py", line 1679, in initialize
console.ts:134 [Extension Host] Info Python Extension: 2019-07-30 12:48:20:     self.init_webapp()  File "/home/adrin/miniconda3/envs/sklearn/lib/python3.7/site-packages/notebook/notebookapp.py", line 1442, in init_webapp    self.http_server.listen(port, self.ip)  File "/home/adrin/miniconda3/envs/sklearn/lib/python3.7/site-packages/tornado/tcpserver.py", line 151, in listen    sockets = bind_sockets(port, address=address)  File "/home/adrin/miniconda3/envs/sklearn/lib/python3.7/site-packages/tornado/netutil.py", line 174, in bind_sockets    sock.bind(sockaddr)OSError: [Errno 99] Cannot assign requested address
notificationsAlerts.ts:40 Jupyter server crashed. Unable to connect.  Error code from jupyter: 1
onDidNotificationChange @ notificationsAlerts.ts:40
_register.model.onDidNotificationChange.e @ notificationsAlerts.ts:26
fire @ event.ts:558
addNotification @ notifications.ts:156
notify @ notificationService.ts:55
r @ mainThreadMessageService.ts:83
_showMessage @ mainThreadMessageService.ts:44
$showMessage @ mainThreadMessageService.ts:38
_doInvokeHandler @ rpcProtocol.ts:394
_invokeHandler @ rpcProtocol.ts:379
_receiveRequest @ rpcProtocol.ts:299
_receiveOneMessage @ rpcProtocol.ts:226
_protocol.onMessage.e @ rpcProtocol.ts:101
fire @ event.ts:558
a @ ipc.net.ts:421
e @ ipc.net.ts:428
fire @ event.ts:558
_receiveMessage @ ipc.net.ts:715
S._socketDisposables.push._socketReader.onMessage.e @ ipc.net.ts:578
fire @ event.ts:558
acceptChunk @ ipc.net.ts:236
_register._socket.onData.e @ ipc.net.ts:197
t @ ipc.net.ts:28
emit @ events.js:182
addChunk @ _stream_readable.js:283
readableAddChunk @ _stream_readable.js:264
Readable.push @ _stream_readable.js:219
onStreamRead @ internal/stream_base_commons.js:94
console.ts:134 [Extension Host] Error Python Extension: 2019-07-30 12:48:20: [Error: Jupyter server crashed. Unable to connect. 
Error code from jupyter: 1	at module.exports.t.HostJupyterExecution.startNotebookServer (/home/adrin/.vscode-oss/extensions/ms-python.python-2019.6.24221/out/client/extension.js:9:75581)]
t.log @ console.ts:134
$logExtensionHostMessage @ mainThreadConsole.ts:38
_doInvokeHandler @ rpcProtocol.ts:394
_invokeHandler @ rpcProtocol.ts:379
_receiveRequest @ rpcProtocol.ts:299
_receiveOneMessage @ rpcProtocol.ts:226
_protocol.onMessage.e @ rpcProtocol.ts:101
fire @ event.ts:558
a @ ipc.net.ts:421
e @ ipc.net.ts:428
fire @ event.ts:558
_receiveMessage @ ipc.net.ts:715
S._socketDisposables.push._socketReader.onMessage.e @ ipc.net.ts:578
fire @ event.ts:558
acceptChunk @ ipc.net.ts:236
_register._socket.onData.e @ ipc.net.ts:197
t @ ipc.net.ts:28
emit @ events.js:182
addChunk @ _stream_readable.js:283
readableAddChunk @ _stream_readable.js:264
Readable.push @ _stream_readable.js:219
onStreamRead @ internal/stream_base_commons.js:94

[Karlheinzniebuhr]

Same issue with Win10 Python 3.8.0 Jupyter server crashed. Unable to connect. Error code from jupyter: 1

[LynxWall]

I was running into the same problem with an environment. I was able to resolve by setting the python.condaPath setting to the full path to conda.exe in my user settings. I have miniconda installed in c:\users[username]\miniconda3

ctrl->shift->P Prefrences: Open Settings (JSON) “python.condaPath”: “C:\Users\[username]\miniconda3\Scripts\conda.exe”

This resolved the issue with opening jupyter in vscode and it now activates my virtual environment when opening a python terminal.