The step described here (http://cockpit-project.org/guide/latest/sso.html) are exactly the steps I do to configure FreeIPA to SSO with kerberos.

If I create a kerberos ticket with "kinit admin", when I go to http://ipasrv/ipa/ui with firefox from my desktop (ipa client), I am logged in without username/password.

But when I go to http://ipasrv:9090 with firefox (cockpit is installed on the ipa server), cockpit asks me for a username and password.
And I log in as root.

On the ipa server, I can run

$ getent passwd smith@example.com
smith:*:1002:1025:John Smith:/home/smith:/bin/bash

$ host -t SRV  _kerberos._udp.example.com
_kerberos._udp.example.com has SRV record 0 100 88 zaira.example.com.


On my desktop, firefox is configured like this:

network.negotiate-auth.trusted-uris    user set     string     .example.com


So I must be missing something.

Regards,
Fuji