When running reports on SSRS server: The server responded with a status of 401 (unauthorized)

Question

When trying to run a report from the SSRS website we receive "Failed to load resource: the server responded with a status of 401 (Unauthorized). DevTools failed to load SourceMap: Could not load content for http://SERVERNAME/reports/assets/css/bootstrap.css.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE.

Answer 1

Hi @Myra Sircy ,

Generally, the 401 error occurs when the user is not authorized to the Report Server.

If Reporting Services is configured to use Kerberos, we didn't register Service Principal Name (SPN) for the account, the error will occur as well.

You may refer below for more message.

configure-windows-authentication-on-the-report-server
register-a-service-principal-name-spn-for-a-report-server

Also you may check the error log for more details.

In SQL Server Reporting Services 2016 or earlier: C:\Program Files\Microsoft SQL Server\MSRS13.MSSQLSERVER\Reporting Services\LogFiles

In SQL Server Reporting Services 2017 later: C:\Program Files\Microsoft SQL Server Reporting Services\SSRS\LogFiles

About the DevTools failed error, you may also refer this to see if you have enabled css source map or not.
https://stackoverflow.com/questions/61205390/when-adding-a-javascript-library-chrome-complains-about-a-missing-source-map-w

Regards，

Zoe

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