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Scenario: Jupyter server 404 "Not Found" error due to "Blocking Cross Origin API" in Azure HDInsight

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This article describes troubleshooting steps and possible resolutions for issues when using Apache Spark components in Azure HDInsight clusters.

Issue

When you access the Jupyter service on HDInsight, you see an error box saying "Not Found". If you check the Jupyter logs, you see something like this:

[W 2018-08-21 17:43:33.352 NotebookApp] 404 PUT /api/contents/PySpark/notebook.ipynb (10.16.0.144) 4504.03ms referer=https://pnhr01hdi-corpdir.msappproxy.net/jupyter/notebooks/PySpark/notebook.ipynb
Blocking Cross Origin API request.  
Origin: https://xxx.xxx.xxx, Host: pnhr01.j101qxjrl4zebmhb0vmhg044xe.ax.internal.cloudapp.net:8001

You may also see an IP address in the "Origin" field in the Jupyter log.

Cause

This error can be due to:

  • If you have configured Network Security Group (NSG) Rules to restrict access to the cluster. Restricting access with NSG rules can still allow you to directly access Apache Ambari and other services using the IP address rather than the cluster name. However, when accessing Jupyter, you could see a 404 "Not Found" error.

  • If you have given your HDInsight gateway a customized DNS name other than the standard xxx.azurehdinsight.net.

Resolution

  1. Modify the jupyter.py files in these two places:

    /var/lib/ambari-server/resources/common-services/JUPYTER/1.0.0/package/scripts/jupyter.py
/var/lib/ambari-agent/cache/common-services/JUPYTER/1.0.0/package/scripts/jupyter.py

  2. Find the line that says: NotebookApp.allow_origin='\"https://{2}.{3}\"' And change this values to: NotebookApp.allow_origin='\"*\"'.

  3. Restart the Jupyter service from Ambari.

  4. Typing ps aux | grep jupyter at the command prompt should show that it allows for any URL to connect to it.

This method is less secure than the setting, which is already present. But it's assumed access to the cluster is restricted and that one from outside is allowed to connect to the cluster as we have NSG in place.

Next steps

If you didn't see your problem or are unable to solve your issue, visit one of the following channels for more support:

  • Get answers from Azure experts through Azure Community Support.

  • Connect with @AzureSupport - the official Microsoft Azure account for improving customer experience. Connecting the Azure community to the right resources: answers, support, and experts.

  • If you need more help, you can submit a support request from the Azure portal. Select Support from the menu bar or open the Help + support hub. For more detailed information, review How to create an Azure support request. Access to Subscription Management and billing support is included with your Microsoft Azure subscription, and Technical Support is provided through one of the Azure Support Plans.