When a realm is joined using the default 'manage-system=true' Join() option, realmd configures the machine to receive and enforce domain policy. realmd should only allow joining one domain with 'manage-system=true' Join() option. An example of a Join() where 'manage-system=false' is from gnome-control-center.
Patrik from QE has highlighted this as something we should implement now, rather than later, so that there's not a regression for users who come to depend on the current (broken) behavior.
Related: https://bugs.freedesktop.org/show_bug.cgi?id=61858
Patch pushed to git master upstream.
realmd-0.14.2-1.fc19 has been submitted as an update for Fedora 19. https://admin.fedoraproject.org/updates/realmd-0.14.2-1.fc19
Package realmd-0.14.2-1.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-0.14.2-1.fc19' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-9364/realmd-0.14.2-1.fc19 then log in and leave karma (feedback).
realmd-0.14.2-1.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.