Timeout flake on GET kernels call.

[gregoryagu]

Description

Creating a new server fails on the "Select A Kernael from "Colab CPU" (or whatever the name of the Server was entered)

Environment

• VS Code version: 1.109.4
• Colab extension version: 0.3.0
• Jupyter extension version: 2025.9.1
• OS (Linux | Mac | Windows): Windows

Repro Steps

Open Py file
Select Kernel Colab
Select CPU
Give name
"Select a Kernal from Colab GPU TF

Error message is displayed "Unable to connect to the remote server"

Note that I am fully logged in. Have tried restarting VS Code, uninstalling, reinstalling, logging out and then in again. Always same message.

I can go to the web and connect just fine.

Expected Behaviour

TODO: A clear and concise description of what you expected to happen.

Actual Behaviour

TODO: A clear and concise description of what's happening instead.

Additional context

TODO: Optionally add any other context about the problem here.

Logs

Logs from Colab in the Output panel (View > Output, change the drop-down the upper-right of the Output panel to Colab).

[2026-02-17T09:22:43.361Z] [Info] Visual Studio Code: 1.109.4
[2026-02-17T09:22:43.361Z] [Info] Remote: N/A
[2026-02-17T09:22:43.361Z] [Info] App Host: desktop
[2026-02-17T09:22:43.361Z] [Info] Jupyter extension version: 2025.9.1
[2026-02-17T09:25:50.018Z] [Trace] tn.provideJupyterServers called with
                                   {
                                     "a": false,
                                     "b": null
                                   }
[2026-02-17T09:25:50.018Z] [Trace] tn.provideJupyterServers returned a Promise
[2026-02-17T09:25:50.018Z] [Trace] tn.provideJupyterServers Promise resolved, args and value:
                                   {
                                     "a": false,
                                     "b": null
                                   }
                                   []
[2026-02-17T09:25:50.020Z] [Trace] tn.provideCommands called with
                                   undefined
                                   {
                                     "a": false,
                                     "b": null
                                   }
[2026-02-17T09:25:50.020Z] [Trace] tn.provideCommands returned a Promise
[2026-02-17T09:25:51.752Z] [Trace] tn.provideCommands Promise resolved, args and value:
                                   undefined
                                   {
                                     "a": false,
                                     "b": null
                                   }
                                   [
                                     {
                                       "label": "$(symbol-event)  Auto Connect",
                                       "description": "1-click connect! Most recently created server, or a new one."
                                     },
                                     {
                                       "label": "$(add)  New Colab Server",
                                       "description": "CPU, GPU or TPU."
                                     },
                                     {
                                       "label": "$(link-external)  Open Colab Web",
                                       "description": "Open Colab web."
                                     },
                                     {
                                       "label": "$(accounts-view-bar-icon)  Upgrade to Pro",
                                       "description": "More machines, more quota, more Colab!"
                                     }
                                   ]
[2026-02-17T09:25:55.899Z] [Trace] tn.handleCommand called with
                                   {
                                     "label": "$(add)  New Colab Server",
                                     "description": "CPU, GPU or TPU."
                                   }
                                   {
                                     "a": false,
                                     "b": null
                                   }
[2026-02-17T09:25:55.899Z] [Trace] tn.handleCommand returned a Promise
[2026-02-17T09:26:10.465Z] [Trace] tn.provideJupyterServers called with
                                   {
                                     "a": false,
                                     "b": null
                                   }
[2026-02-17T09:26:10.465Z] [Trace] tn.provideJupyterServers returned a Promise
[2026-02-17T09:26:10.466Z] [Trace] Scheduled connection refresh for "Colab GPU T4" in 3299994ms
[2026-02-17T09:26:10.466Z] [Trace] tn.handleCommand Promise resolved, args and value:
                                   {
                                     "label": "$(add)  New Colab Server",
                                     "description": "CPU, GPU or TPU."
                                   }
                                   {
                                     "a": false,
                                     "b": null
                                   }
                                   {
                                     "id": "a69f8ed7-ab1e-4299-9478-1efc67f9679a",
                                     "label": "Colab GPU T4",
                                     "variant": "GPU",
                                     "accelerator": "T4",
                                     "endpoint": "gpu-t4-s-ix9i6bgukejj",
                                     "connectionInformation": {
                                       "baseUrl": {
                                         "$mid": 1,
                                         "external": "https://8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev/",
                                         "path": "/",
                                         "scheme": "https",
                                         "authority": "8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev"
                                       },
                                       "token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                       "tokenExpiry": "2026-02-17T10:26:10.460Z",
                                       "headers": {
                                         "X-Colab-Runtime-Proxy-Token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                         "X-Colab-Client-Agent": "vscode"
                                       }
                                     },
                                     "dateAssigned": "2026-02-17T09:26:10.460Z"
                                   }
[2026-02-17T09:26:10.491Z] [Trace] tn.provideJupyterServers called with
                                   {
                                     "a": false,
                                     "b": null
                                   }
[2026-02-17T09:26:10.491Z] [Trace] tn.provideJupyterServers returned a Promise
[2026-02-17T09:26:11.028Z] [Trace] tn.provideJupyterServers Promise resolved, args and value:
                                   {
                                     "a": false,
                                     "b": null
                                   }
                                   [
                                     {
                                       "id": "a69f8ed7-ab1e-4299-9478-1efc67f9679a",
                                       "label": "Colab GPU T4",
                                       "variant": "GPU",
                                       "accelerator": "T4",
                                       "endpoint": "gpu-t4-s-ix9i6bgukejj",
                                       "connectionInformation": {
                                         "baseUrl": {
                                           "$mid": 1,
                                           "path": "/",
                                           "scheme": "https",
                                           "authority": "8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev"
                                         },
                                         "token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                         "tokenExpiry": "2026-02-17T10:26:10.460Z",
                                         "headers": {
                                           "X-Colab-Runtime-Proxy-Token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                           "X-Colab-Client-Agent": "vscode"
                                         }
                                       },
                                       "dateAssigned": "2026-02-17T09:26:10.460Z"
                                     }
                                   ]
[2026-02-17T09:26:11.066Z] [Trace] tn.provideJupyterServers Promise resolved, args and value:
                                   {
                                     "a": false,
                                     "b": null
                                   }
                                   [
                                     {
                                       "id": "a69f8ed7-ab1e-4299-9478-1efc67f9679a",
                                       "label": "Colab GPU T4",
                                       "variant": "GPU",
                                       "accelerator": "T4",
                                       "endpoint": "gpu-t4-s-ix9i6bgukejj",
                                       "connectionInformation": {
                                         "baseUrl": {
                                           "$mid": 1,
                                           "path": "/",
                                           "scheme": "https",
                                           "authority": "8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev"
                                         },
                                         "token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                         "tokenExpiry": "2026-02-17T10:26:10.460Z",
                                         "headers": {
                                           "X-Colab-Runtime-Proxy-Token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                           "X-Colab-Client-Agent": "vscode"
                                         }
                                       },
                                       "dateAssigned": "2026-02-17T09:26:10.460Z"
                                     }
                                   ]
[2026-02-17T09:26:32.650Z] [Trace] tn.provideJupyterServers called with
                                   {
                                     "a": false,
                                     "b": null
                                   }
[2026-02-17T09:26:32.650Z] [Trace] tn.provideJupyterServers returned a Promise
[2026-02-17T09:26:33.205Z] [Trace] tn.provideJupyterServers Promise resolved, args and value:
                                   {
                                     "a": false,
                                     "b": null
                                   }
                                   [
                                     {
                                       "id": "a69f8ed7-ab1e-4299-9478-1efc67f9679a",
                                       "label": "Colab GPU T4",
                                       "variant": "GPU",
                                       "accelerator": "T4",
                                       "endpoint": "gpu-t4-s-ix9i6bgukejj",
                                       "connectionInformation": {
                                         "baseUrl": {
                                           "$mid": 1,
                                           "path": "/",
                                           "scheme": "https",
                                           "authority": "8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev"
                                         },
                                         "token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                         "tokenExpiry": "2026-02-17T10:26:10.460Z",
                                         "headers": {
                                           "X-Colab-Runtime-Proxy-Token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                           "X-Colab-Client-Agent": "vscode"
                                         }
                                       },
                                       "dateAssigned": "2026-02-17T09:26:10.460Z"
                                     }
                                   ]
[2026-02-17T09:27:45.825Z] [Trace] Y1.shouldKeepAlive called with
                                   {
                                     "id": "a69f8ed7-ab1e-4299-9478-1efc67f9679a",
                                     "label": "Colab GPU T4",
                                     "variant": "GPU",
                                     "accelerator": "T4",
                                     "endpoint": "gpu-t4-s-ix9i6bgukejj",
                                     "connectionInformation": {
                                       "baseUrl": {
                                         "$mid": 1,
                                         "external": "https://8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev/",
                                         "path": "/",
                                         "scheme": "https",
                                         "authority": "8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev"
                                       },
                                       "token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                       "tokenExpiry": "2026-02-17T10:26:10.460Z",
                                       "headers": {
                                         "X-Colab-Runtime-Proxy-Token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                         "X-Colab-Client-Agent": "vscode"
                                       }
                                     },
                                     "dateAssigned": "2026-02-17T09:26:10.460Z"
                                   }
                                   []
[2026-02-17T09:27:45.825Z] [Trace] Y1.shouldKeepAlive returned a Promise
[2026-02-17T09:27:45.826Z] [Trace] Y1.shouldKeepAlive Promise resolved, args and value:
                                   {
                                     "id": "a69f8ed7-ab1e-4299-9478-1efc67f9679a",
                                     "label": "Colab GPU T4",
                                     "variant": "GPU",
                                     "accelerator": "T4",
                                     "endpoint": "gpu-t4-s-ix9i6bgukejj",
                                     "connectionInformation": {
                                       "baseUrl": {
                                         "$mid": 1,
                                         "external": "https://8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev/",
                                         "path": "/",
                                         "scheme": "https",
                                         "authority": "8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev"
                                       },
                                       "token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                       "tokenExpiry": "2026-02-17T10:26:10.460Z",
                                       "headers": {
                                         "X-Colab-Runtime-Proxy-Token": "eyJhbGciOiJFUzI1NiIsImtpZCI6InJHU3h3QSJ9.eyJhdWQiOiJncHUtdDQtcy1peDlpNmJndWtlamoiLCJleHAiOjE3NzEzMjM5NjksInBvcnQiOjgwODB9.L6gDbS_SnqtRPAnCymIJPLV3w8HRD9BwKc1lCclyfOh42OtW2H2tjYrcS5QObULknPWbx0uzbb3VFV3p4gu2tA",
                                         "X-Colab-Client-Agent": "vscode"
                                       }
                                     },
                                     "dateAssigned": "2026-02-17T09:26:10.460Z"
                                   }
                                   []
                                   false

Logs from Jupyter in the Output panel (View > Output, change the drop-down the upper-right of the Output panel to Jupyter).

11:22:45.789 [info] Process Execution: ~\AppData\Local\Programs\Python\Python313\python.exe ~\.vscode\extensions\ms-toolsai.jupyter-2025.9.1-win32-x64\pythonFiles\vscode_datascience_helpers\kernel_interrupt_daemon.py --ppid 20668
    > cwd: ~\.vscode\extensions\ms-toolsai.jupyter-2025.9.1-win32-x64\pythonFiles\vscode_datascience_helpers
11:22:45.923 [info] Process Execution: ~\AppData\Local\Programs\Python\Python313\python.exe -m ipykernel_launcher --f=~\AppData\Roaming\jupyter\runtime\kernel-v339317a6adaad0c73d305dbfdf98487c2ede14d3d.json
    > cwd: c:\Dev\Test\Colab
11:22:47.736 [info] Kernel successfully started
11:22:47.749 [info] Process Execution: ~\AppData\Local\Programs\Python\Python313\python.exe ~\.vscode\extensions\ms-toolsai.jupyter-2025.9.1-win32-x64\pythonFiles\printJupyterDataDir.py
11:26:32.649 [error] Error fetching kernels from https://8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev/ (Colab GPU T4): [FetchError: request to https://8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev/api/kernels?1771320371070 failed, reason: connect ETIMEDOUT 34.144.254.29:443

[kevineger]

[FetchError: request to https://8080-gpu-t4-s-ix9i6bgukejj-c.asia-southeast1-0.prod.colab.dev/api/kernels?1771320371070 failed, reason: connect ETIMEDOUT

From the Jupyter logs, it looks like the call to get kernels timed out. Was this a one off, or was it consistently happening? Is it still happening?