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If it is not a custom error page in the browser, then it must be a custom error page in the PaloAlto. But I would suspect the browser first. In the PaloAlto custom error/blocked pages can be setup from:

   Device -> Response Pages

https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-web-interface-help/device/device-response-pages

 

However, changing the response page is not going to fix the problem. It is a web coding error in the page that causes a security block. The Wildfire Analysis Report tab is an iframe within the Wildfire Monitor page and the HTML explicitly blocks iframes.

 

This is known PaloAlto bug PAN-183826 which affects PANOS multiple versions. There are recently released fixes for the bug in versions:

  9.1.14

  10.0.9

  10.1.??? - No fix yet? Not listed in release notes.

  10.2.1

 

There is a workaround which is to extract the URL to the iframe and copy/paste it into a new browser window. From your PaloAlto, right click in the Wildfire Analysis Report tab and select "View frame source".

2022-06-25_113401.png

 

Then edit the URL in the new window to remove the "view-source:".

2022-06-25_113441.png

 

Then you can see the report.

2022-06-25_114035.png

 

 

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