HTML viewer stopped working

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Report Viewer - Angular Report Viewer - HTML5
Luis
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Luis asked on 06 May 2023, 01:33 AM | edited on 06 May 2023, 01:54 AM

The html viewer stopped working for one of our customers. The site has not been updated since Feb 2023. At first, I thought that the issue was related to CORS, but after changing the project to allow all methods, all origins, basically accepting all requests, the viewer continued to throw the exception attached.

Any guidance as to what to review on the clients browsers to troubleshoot this issue will be highly appreciated. When trying from different locations, the same report works as expected. I think that something is blocking the CORS headers somehow.

The front-end is an angular application, backend is on an azure app service. This exception is only happening for just a set of users. we have used Chrome, Edge and Firefox. 

The error is also happening from an Ipad when using Chrome and Safari.

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Todor
Telerik team
answered on 10 May 2023, 12:12 PM

Hi Luis,

If I understood correctly, the viewer stopped working without any changes in the Reporting application and for a set of users only. This means that something has changed in their environment. Can you check what?

The error indicates that the Get Version request doesn't pass. This usually means that the Reporting REST Service is not responding or the viewer cannot access it. Unfortunately, it is not clear why.

I suggest attaching a Trace Listener to the REST Service to see the errors server-side. If you use .NET or .NET Core, check the KB article Troubleshooting reporting implementation into ASP.NET Core application.

You may also use FiddlerJam to check the communication between the viewer and the service for more details.

Regards,
Todor
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Report Viewer - Angular Report Viewer - HTML5
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Luis
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Todor
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