Microsoft (Azure ML) Notebook pages hang and browser shows "Website not responding

Mohammed Abdullah 5 Reputation points
2026-07-06T09:12:40.5233333+00:00

Hi everyone,

I'm experiencing an issue while opening my Microsoft notebooks. Whenever I try to open a notebook, the page hangs, and eventually the browser displays "Website not responding." The notebook never loads.

A few things I've already checked:

This is not limited to a single tenant or organization. I tested with another Microsoft account from a different organization and I'm seeing the exact same behavior.

The issue occurs across multiple notebooks.

Has anyone else experienced this recently? Are there any known service outages or recommended troubleshooting steps?

Any help would be appreciated. Thank you!

Azure Machine Learning

2 answers

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  1. Anshika Varshney 14,870 Reputation points Microsoft External Staff Moderator
    2026-07-07T13:23:40.23+00:00

    Hello @Mohammed Abdullah

    Sorry you're experiencing this issue.

    When Azure ML Notebook pages hang and eventually show "Website not responding", it can be related to connectivity between the notebook UI and the underlying compute instance or Jupyter service.

    Please try the following:

    1. Verify the compute instance is running
      • Go to Azure ML Studio > Compute and confirm the notebook is attached to a running compute instance.
    2. Restart the compute instance
      • Restart the compute instance and then reopen the notebook.
    3. Test with a new compute instance
      • If the issue persists, create a new compute instance and check whether the notebook loads correctly.
    4. Check network and websocket connectivity
      • Notebook access relies on websocket communication. Ensure your network, proxy, or firewall is not blocking connections to Azure ML notebook endpoints.
    5. If using a private endpoint workspace
      • Verify DNS resolution and connectivity to the compute instance from within the configured network environment.
    6. Try browser isolation steps
      • Test from another browser or an InPrivate/Incognito session and clear browser cache if needed.

    Reference:

    I Hope this helps. Do let me know if you have any further queries.
    Thank you.

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  2. Jerald Felix 17,470 Reputation points Volunteer Moderator
    2026-07-06T16:56:26.0066667+00:00

    Hello Mohammed Abdullah,

    Greetings! Thanks for raising this question in the Q&A forum.

    Since you've confirmed this happens across multiple notebooks and even with a different Microsoft account from a separate organization, this rules out a workspace-specific permission or tenant configuration issue. That points to either something in your local browser/network environment blocking the notebook editor's resources, or a broader client-side rendering issue rather than a backend outage tied to one workspace. The notebook experience in Azure ML Studio loads a heavy JavaScript-based editor plus a live WebSocket connection to your compute instance, so it is especially sensitive to browser extensions, proxies, and cached files.

    Here is how to narrow it down.

    1. Check Azure Service Health first

    Go to Azure Portal > Help + Support > Service Health > Service issues and filter for Azure Machine Learning in your region. This confirms whether there's a known active incident before you spend time on client-side troubleshooting.

    2. Confirm your compute instance is Running

    In Azure Machine Learning Studio, go to Compute and check the state of the compute instance backing the notebook. If it shows Stopped, Creating, or Failed, the notebook editor can hang indefinitely trying to attach a kernel. Start it if stopped, or recreate it if failed.

    3. Test in a clean browser session

    Open an incognito/private window with all extensions disabled and try the notebook again. Ad blockers, security extensions, and content filtering extensions are a common cause of exactly this symptom, since they can silently block the WebSocket or script requests the notebook editor depends on.

    4. Clear browser cache and try a different browser

    Clear cache and cookies for https://ml.azure.com, then retry. If possible, test in a completely different browser (for example Edge if you were using Chrome) to isolate whether it's browser specific.

    5. Try opening the notebook in Jupyter or VS Code Web instead of the Studio editor

    From the notebook toolbar, use the dropdown next to the editor selector and try Jupyter or VS Code (Web) instead of the default Studio notebook editor. This helps identify whether the issue is specific to the Studio notebook rendering engine itself.

    6. Check for network or proxy blocking

    If you're on a corporate network, VPN, or behind a proxy, confirm that your firewall isn't blocking the storage account or Azure ML dependent URLs used to load notebook content. Since you reproduced this on a second organization's account too, this is less likely, but still worth ruling out if both environments share the same network path (for example, same corporate VPN or DNS).

    7. Open a support ticket if it persists

    If none of the above resolves it, this needs backend investigation. Open a ticket through https://aka.ms/azuresupport with Service set to Azure Machine Learning, and include your workspace region, browser and version, and whether Jupyter/VS Code Web modes also hang.

    If this answer helps you kindly accept the answer which will help others who have similar questions.

    Best Regards,

    Jerald Felix.

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