After a kickstart install or other use of realmd of in install mode, sssd or winbind is not enabled, which prevents logins and use of authentication.
realmd-0.14.1-1.fc19 has been submitted as an update for Fedora 19. https://admin.fedoraproject.org/updates/realmd-0.14.1-1.fc19
Package realmd-0.14.1-1.fc19: * should fix your issue, * was pushed to the Fedora 19 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing realmd-0.14.1-1.fc19' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-8135/realmd-0.14.1-1.fc19 then log in and leave karma (feedback).
realmd-0.14.1-1.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.