vscode-jupyter: Timed out waiting to get a heartbeat from kernel process.` When trying to open ipynb

Environment data

• VS Code version: Version: 1.51.1
• Jupyter Extension version v2020.12.414227025
• Python Extension version v2020.11.371526539
• OS (Windows | Mac | Linux distro) and version:OS: Windows_NT x64 10.0.18363
• Python and/or Anaconda version: XXX
• Type of virtual environment used (N/A | venv | virtualenv | conda | …): all
• Jupyter server running: Local

Actual behaviour

Tried apply9ng solution from other threads where this issue was reported, no result though.

Timed out waiting to get a heartbeat from kernel process.` When trying to open ipynb. Both for virt env as wel as Python

[Extension Host] rejected promise not handled within 1 second: Error: Timed out waiting to get a heartbeat from kernel process. t.log @ console.ts:140 console.ts:137 [Extension Host] stack trace: Error: Timed out waiting to get a heartbeat from kernel process. at m.waitForHeartbeat (c:\Users\48797.vscode\extensions\ms-toolsai.jupyter-2020.12.414227025\out\client\extension.js:49:637256) t.log @ console.ts:140 mainThreadExtensionService.ts:65 [[object Object]]Timed out waiting to get a heartbeat from kernel process. $onExtensionRuntimeError @ host.ts:10 mainThreadExtensionService.ts:66 Error: Timed out waiting to get a heartbeat from kernel process. at m.waitForHeartbeat (c:\Users\48797.vscode\extensions\ms-toolsai.jupyter-2020.12.414227025\out\client\extension.js:49:637256) $onExtensionRuntimeError @ host.ts:10 DevTools failed to load SourceMap: Could not load content for https://ticino.blob.core.windows.net/sourcemaps/e5a624b788d92b8d34d1392e4c4d9789406efe8f/node_modules/windows-process-tree/lib/index.js.map: Unknown error