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No Firefox Report Server login prompt (January 2019 release)

Upon upgrading our Power BI Report Server (W2K12 R2) to the January 2019 release (15.0.1102.235), Firefox displays a blank page with no login prompt, other browsers IE11, Edge, Chrome work as expected.

Has anyone experienced this? We have a nearly identical server running August 2018 release ( with no issues.

Have not seen/heard any common issues regarding firefox. Assuming your server is configured for windows authentication (default), you might want to double check the settings in your browser:


Thanks for the suggestion.  I tried the settings from the link, the issue was still present; however, I changed the RSWindowsNegotiate to RSWindowsNTLM and this resolved the issue for Firefox.  Otherwise, Kerberos was working before the change.

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