I can also confirm this is a normal occurrence on Windows while using Chrome and Edge. Firefox, however, does not do this. It is a bit confusing for new users of IPA as they will generally treat it as a login prompt, although it doesn't do anything for them. I have been curious about this prompt, but haven't had a chance to look into it yet.

On Wed, Sep 22, 2021, 3:51 PM Sam Morris via FreeIPA-users <freeipa-users@lists.fedorahosted.org> wrote:
> Florence Renaud via FreeIPA-users wrote:
> IIRC some browsers, notably on Windows, when the initial GSSAPI
> handshake fails because there is no ticket, may either throw an error
> because they are trying NTLM auth or don't understand the basic fallback.
> What browser(s) are you seeing the issue on?

I see this on Windows 10 Home with Chrome 93.0.4577.82 (and older versions).

I get two login prompts - the first is caused by a POST to /ipa/session/json resulting in a 401.

The second is caused by a GET for /ipa/session/login_kerberos?_=<some timestamp>.

Both responses have the WWW-Authenticate: Negotiate header.

I happen to have MIT Kerberos for Windows installed--that may or may not be relevant. I've not (as far as I remember) configured Chrome to try to use SPNEGO to talk to my IPA servers so this may not be relevant.

Sam Morris <https://robots.org.uk/>
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