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Intranet site 401 Unauthorized kerberos SSO

Firefox Web compatibility
jbr replied 2 hari yang lalu
Rasmus Geisor
Rasmus Geisor

Hi!

We have a intranet site that works in Edge and Chrome without issues with the site added to "internet options". But for some reason we are getting 401 Unauthorized when trying to access it from Firefox. I have tried adding the urls to: network.automatic-ntlm-auth.trusted-uris network.automatic-ntlm-auth.allow-proxies: true network.automatic-ntlm-auth.allow-non-fqdn: true network.auth.force-generic-ntlm: false network.auth.force-generic-ntlm-v1: false

Ingocnito mode , same error. I have tried disabling all plugins. Disabled DNS over HTTPS.

HTTP/1.1 401 Unauthorized Server: Microsoft-IIS/10.0 WWW-Authenticate: Negotiate X-Powered-By: ASP.NET Date: Mon, 25 May 2026 08:15:41 GMT Content-Length: 0

Regards Rasmus

Hi! We have a intranet site that works in Edge and Chrome without issues with the site added to "internet options". But for some reason we are getting 401 Unauthorized when trying to access it from Firefox. I have tried adding the urls to: network.automatic-ntlm-auth.trusted-uris network.automatic-ntlm-auth.allow-proxies: true network.automatic-ntlm-auth.allow-non-fqdn: true network.auth.force-generic-ntlm: false network.auth.force-generic-ntlm-v1: false Ingocnito mode , same error. I have tried disabling all plugins. Disabled DNS over HTTPS. HTTP/1.1 401 Unauthorized Server: Microsoft-IIS/10.0 WWW-Authenticate: Negotiate X-Powered-By: ASP.NET Date: Mon, 25 May 2026 08:15:41 GMT Content-Length: 0 Regards Rasmus

Semua Balasan (24)

jbr
jbr
  • 10 Kontributor Teratas

Interestingly, this bugzilla.mozilla.org/1179722 recently landed — if you wanted to try v154+ in case you were affected by this.

Rasmus Geisor
Rasmus Geisor Pemilik pertanyaan

Thanks!!

Ill have a look into it :)

Regards Rasmus

Rasmus Geisor
Rasmus Geisor Pemilik pertanyaan

Hi!

The site is opening now as it should!

Thank you! :)

Regards Rasmus

jbr
jbr
  • 10 Kontributor Teratas

Ooh that's awesome, this was really hidden in the API! Thanks so much for your help with this, Rasmus —truly appreciated!

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