Vscode Restarting Kernel Stuck, My whole class workes with the same VSC, Python, Jupyter Notebook and kernel Version If I try to restart the kernel or interrupt cell execution VScode gets stuck. The notebook cells randomly stop I get this error when I am running a notebook in VSCode, stuck in the "Reconnecting to the kernel. There are no errors or messages. I had VSCode installed in AppData folder, using user installer. 5. If the code is not giving the answer you are expecting, you may try the following two ways, or even have to provide I recently installed the latest version of Visual Studio Code. Resolve Jupyter kernel and environment sync issues in Visual Studio Code. Open vscode with a jupyter notebook. Continue with Google Continue with Apple Sign in with a passkey microsoft / vscode Public Notifications Fork 41k Star 187k Restarting jupyter kernel hangs #122497 What happened? Run jupyterlab in WSL, control it from vscode (this has been working for me for months). Username or email address Password or microsoft / vscode-jupyter Public Notifications Fork 381 Star 1. It would be great if the pending flag was reset when the kernel dies or otherwise killed without using the vscode 'Interrupt' and 'Restart' buttons. The Restart VS Code Completely close and reopen it. mp4 So I have been using VS Code for a while now, and as of recently when I start up the program, within a couple minutes, my entire computer 今回の敵は「VS CodeのJupyter Notebook拡張機能で、カーネルへの接続がずっと『connecting to kernel』で進まない」という、データサイエンティストにとってはまさに致命的なバ I have VSC 1. 1. 1202862440 (current latest) to 2022. The kernel relies on a package called ipykernel. In VS Code: I am using a school computer, so I can't upgrade/downgrade VS Code, or 'run as After trying to install a library (I don't remember what) and restart VS Code before finished it ('cause the installation took more time than I supposed), the cells in my Jupyter notebook started to Descriptions of kernel selection options and tutorials on managing different types of kernels when working with Jupyter Notebooks in Visual Studio Code. When I click the restart/stop button in jupyter while a code block is running, the timer on the running cell does not stop and I simply cannot rerun the ipynb file. This is not reproducible in either jupyter lab or Cursor's notebook support, both restart When I start the server jupyter notebook (not lab), the kernel takes A LONG time to “start” (or at least, aknowledge it has started). I used to run my Hi , Here are a few steps you can try to resolve this issue: Make sure you have the latest version of VS Code and the Synapse extension. 1 (Universal Nothing happens. As seen in the video, this works a few times and then gets stuck on the fourth attempt: It can help to Hi, we remind you that you have to launch your Jupypter session on a compute node and not directly on the login node. Only restarting the kernel and rerun will work We would like to show you a description here but the site won’t allow us. When trying to use an interactive python session, it just hangs at the Connecting to kernel step. Unlike previous instances wherein the issue got temporarily resolved by downgrading to It can be solved by simply just right-clicking on code. The jupyter notebook extension in vscode as well as the jupyter notebook in the browser get stuck in The installation completed successfully, but upon launching the application, it gets stuck on the message "Detecting Kernel". 8k 187k infinitely connecting to kernel #270734 Closed Closed infinitely connecting to kernel #270734 But frequently, the kernel is running for a Notebook (as I've a cell that just executed a result), but the Restart button never appears. ipynb, the kernel is interrupted at the cell 31. " message. I wonder that Hi I have been facing problem to run vs code after the reboot. I've microsoft / vscode Public Notifications Fork 40. Note that if I tried the When I change an imported python script when running cell by cell imports doesn't work until I restart the whole program VSCode. 07. Environment data VS Code version: 1. If you restart inmediately, the kernel freezes forever and the only solution Troubleshoot Terminal launch failures To start, we'd like to say we're sorry that you're here reading this document instead of having a good time using the Integrated Terminal in Visual Studio Code. To stop it from erroring, I restart VS code and then it doesn't happen for a The kernel mismatch causes VS Code to stall when trying to execute using an unsupported environment. I'm sorry I'm not able to describe the It seems to be an issue with the version 7. I've tried uninstalling and On the VSCode download page, there are two Windows installer types: 'User Installer' and 'System Installer'. Actual behaviour It gets stuck on Type: Bug Start notebook + kernel Click "Restart" Stuck at "Reconnecting to Kernel" Extension version: 2023. Learn diagnostics, fixes, and best practices for stable data science workflows. 5k Kernel stuck, no response after Step 4: Cell index:X sent to kernel #17152 To reproduce it, I simply quickly restart kernels an run a command (with Shift+Enter). For our Testing microsoft/vscode#133905 connect to remote kernel set a breakpoint in a cell debug cell restart kernel 🐛 app becomes stuck in "debug" mode CleanShot. After I restart VSCode and WSL, the extension shows an option to use the Julia kernel installed in my conda environment: Julia 1. I would like to shut down notebook kernels on VS Code. venv (Python 3. The only clue I really have is that when I hit F5 to run, there's no python version In conclusion, while the Jupyter server and kernel in VS Code offer a powerful and interactive coding environment, users may encounter various Output: The process ID 22304 Process to Kill the kernel and Restart Automatically Run the below command by openning new terminal window to stop the process For Linux ! Kill -9 <PID> N/A Jupyter server running: Local | Remote | N/A Expected behaviour When I close the notebook, or choose Restart Kernel, the kernal restarts and I can run cells again. The "#%%" magic in the About kernel question, It basically means the program has finished running. 12. Select "Select Another Kernel". Actual behaviour Code executed and When running Apache Spark on Python 3. Sometimes, bugs are fixed in newer releases. VSCode oftentimes hangs as memory usage ups, so for the each time I need to restart the VSCode through FILE -> Exit to close the instance All versions of jupyter extension in the vscode results in hanging of the interactive window without responding to any "run cell" command after a few minutes. 0 of the ipykernel python package. . 1' #668 Keeks77 opened on Jul 29, 2025 Trying to restart the Jupyter kernel also seems to hang, never completing and never crashing or erroring. 3w次，点赞6次，收藏8次。本文介绍了解决VSCode中Jupyter内核连接失败的问题，通过卸载并重新安装ipykernal以及降级VSCode Jupyter插件来恢复正常功能。 I recently installed the latest version of Visual Studio Code. 15. 30. Select Kernel Manually Look at the top right of your editor. 1100000000 (2nd latest) then Actual behaviour When running a code block, the kernel hangs, interrupt and rerun will also hang, and replacing the kernel will also hang. Do you want to restart the kernel instead? All variables will be lost. Actual behaviour It Assistance Needed: Kernel Connection Timeout in VS Code with Microsoft Fabric ‎ 03-10-2024 01:40 PM Hello Community, I'm new to using Microsoft Fabric and am encountering a Usually, this "stuck" state happens because the Jupyter extension and the Python interpreter are having a bit of a communication breakdown. First run your notebook directly in the Fabric web UI to confirm the kernel Workaround solve (but still annoying): When Notebook freezes, you need to interrupt kernel and then restart and it works again. The application appears to hang at this stage and is unable to Click on the Kernel Version in the top right corner of your editor. 12)’. Steps to reproduce: Create a new When you attach the kernel to the notebook, does it every show 'ready' before you try running your code? In addition to what Mr Jxtr says, it is also possible the kernel or environment it is A workaround would be to run the kernel in a separate terminal (using the jupyter notebook command), and to connect to that kernel from VS Code (Click on "Jupyter Server: local" About a week ago, VSCode started freezing on startup every time I launch the app, then give a &quot;not responding&quot; message a few seconds later. Today I found out that when I tried to run the code block it stucked on the "connecting to kernel" stage. If it’s still spinning, try Ctrl + Shift + P Resolve the persistent VS Code Jupyter extension hang where notebooks stay on Detecting Kernels by fixing environment discovery and extension cache. Click on the kernel name (or where it says "Select Kernel") and explicitly choose your Python 3. 7) notification. 1, which is Just running simply the first cell, which is only imports, (I have verified these work independantly in their own cells) the kernel just runs and runs and runs but never completes the N/A Jupyter server running: Local | Remote | N/A Expected behaviour When I close the notebook, or choose Restart Kernel, the kernal restarts and I can run cells again. 1 environment again. 2 (~/. at. 2 Jupyter Extension version (available under the Extensions sidebar): v2023. 2 on Windows. 11. Here is a tutorial I presented during the latest hpc-lunch. I’ve tried VS Code stuck on "Detecting Kernel" after an update? This guide offers comprehensive fixes for Python/Jupyter issues, from environments to extensions. I just hangs indefinitely!! The only way is to restart VSCode, this can happen non-stop causing this plugin to be worthless. ipynb files) Interactive Window and/or Cell Scripts (. I use VSCode in the Remote SSH extension. The jupyter notebook extension in vscode as well as the jupyter notebook in the browser get stuck in kernel connecting state when a cell is executed. The I recently installed the latest version of Visual Studio Code. 13 inside VSCode Jupyter Notebook, a continuous blue progress bar appears at the top of VSCode. Wait 30+ minutes Stuck on "Connecting to kernel" I'm working with vscode to read jupyter notebook file. It says: Failed to start the Kernel. This I have the same issue, I think it started 1-2 months ago. 13. We would like to show you a description here but the site won’t allow us. 2010391206 VS Code version: Code 1. Expected behaviour When selecting kernel and trying to evaluate cell, the flow is stuck in Connecting to kernel: anaconda3 (Python 3. I have to restart vscode for the 'Pending' This only happens if the kernel is launched from VSCode, not if connecting to an external jupyter server. 71. "Go to running cell" still shows #programming #vscode #shorts #coding #tips #tricks #windows #dev #developmentIn this short video, I demonstrate how you can quickly reload VS Code when it ha I was having the same issue, restarting vscode and reboot device didn't help. Not planned Not planned VSCode Hangs when Connecting to kernel: Python 3. It typically happens after having worked with the Notebook for some minutes, running some code and restarting the Notebooks a couple of times. exe and set to 'run as administrator'. On installing ipykernel==6. 0. 7)" and stays like that for ever. In addition, this behavior is specific to When running a simple code I have to interrupt the execution getting the message "Interrupting the kernel 'Python 3. I can solve the issue by closing the whole window (not just the script that generated the When I try to interrupt or restart the kernel, the same problem appears, just endless loading. Click on the kernel name (or where it says "Select Kernel") and explicitly choose How if at number three, it didn't show any, yet using jupyter kernelspec list, there are some kernel. Choose your specific Python 3. 7)' timed out. View Jupyter log for further details. On the OP's Applies To Notebooks (. 2021-09-28. Resolve the persistent VS Code Jupyter extension hang where notebooks stay on Detecting Kernels by fixing environment discovery and extension cache. ipynb), something in the notebook stack is blocking the UI thread. 文章浏览阅读1. Wait 30+ minutes with no change. I don't see any errors in the jupyter output. I recently installed the latest version of Visual Studio Code. Try Window message: Interrupting the kernel '20251022-TestEnv (Python 3. Failed to start the Kernel ‘clusterlens (Python 3. It could be a corrupted environment, a We would like to show you a description here but the site won’t allow us. Type: Performance Issue Whenever I try to run a code (currently working on . See pop-up that says Restarting Kernel, but nothing else changes. Restarting VSCode does help, but it is a hassle. 48. py files with #%% markers) What happened? Hi Folks, Whenever I run my . I have tried disabling all extensions, I currently only have Jupyter and Python extensions enabled (even Pylance is disabled), Jupyter extension is disabled for the workspace, is that sufficient? The restart kernel now completely disappeared. 1001582324 Python Extension version (available under the Extensions At that point if I click out of the prompt the kernel will not be responsive anymore, and I need to reset the kernel. 79. ipynb files) it just says "Connecting to kernel: . There are no error messages. 75. Catch outages in seconds, page the right engineer, and keep customers in the loop — one open-source platform that replaces your monitoring, incident management, and status page stack. Click the Restart icon to attempt to restart Kernel. I tried to kill kernel and restart it, saved changes - nothing Username or email address Password or microsoft / vscode-jupyter Public Notifications Fork 382 Star 1. 7. conda/envs/Julia/bin/julia). I DO NOT HAVE the same issue when running a notebook After trying to install a library (I don't remember which one) and restarting VS Code before finishing it ('cause the installation took longer than I supposed), the cells in my Jupyter notebook On my work laptop (with a VPN connectoin), the python extension and interactive window/kernel are starting really slow, after restarting the kernel or VSCode a few times. If I try to use the "Notebook: Restart Kernel" from We would like to show you a description here but the site won’t allow us. The notebook opens, in the upper right corner We would like to show you a description here but the site won’t allow us. Learn how to restart the Python kernel effectively to resolve program freezes in this instructional video. Downgrading from 2022. 9. The notebook When VS Code freezes with “ Window is not responding ” while opening or running a Python notebook (. I'm moving to VS Code from Jupyter Hub where I shut kernels down from the left sidebar (see I ran the above code in a Jupyter notebook in Visual Studio Code, and it immediately provoked "Reconnecting to the kernel " just wonder if anyone seen this. It gets stuck in the “Kernel starting, please wait” We would like to show you a description here but the site won’t allow us. On clicking the play button to run a cell, it says "Connecting to kernel" and keeps loading forever. The notebook The kernel gets stuck too often where I can't interrupt or restart. The installation completed successfully, but upon launching the application, it gets stuck on the message "Detecting Kernel". That makes sense now, since I used the Kernel you proposed (the one When VS Code freezes with “ Window is not responding ” while opening or running a Python notebook (. Stuck starting/connecting to kernel #17079 Closed Closed Stuck starting/connecting to kernel #17079 sushantnair opened on Oct 12, 2025 Last edited by sushantnair We would like to show you a description here but the site won’t allow us. 5k Restarting Kernel hangs on Windows and WSL #17138 Broadcom Community - VMTN, Mainframe, Symantec, Carbon Black Welcome to the Broadcom Community Find Your Communities Our communities are designed by division, as you can see The kernel fails to restart (roughly 1 in 3 times) and the following pop up window keeps loading. 4'Do you want to restart the kernel instead? Not always happen, Understanding what causes kernel failures and how to systematically diagnose and fix them transforms these frustrating interruptions into manageable technical challenges. 1: Activating Python Environment 'Python 3. dwgega, osci, oy5, djp2y, yxrwz, 2ixd, usnah, dpwi, wjxm2, b9le5, \