The version in Fedora contains a bug which is affecting FreeIPA: https://github.com/pythongssapi/python-gssapi/issues/72. Please update to current upstream version - 1.1.2 - in rawhide and f23, which fixes it.
python-gssapi-1.1.2-1.fc23 has been submitted as an update to Fedora 23. https://bugzilla.redhat.com/show_bug.cgi?id=1254458
python-gssapi-1.1.2-1.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report.\nIf you want to test the update, you can install it with \n su -c 'yum --enablerepo=updates-testing update python-gssapi'. You can provide feedback for this update here: https://bodhi.fedoraproject.org/F23/FEDORA-2015-13827
python-gssapi-1.1.3-1.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report.\nIf you want to test the update, you can install it with \n su -c 'yum --enablerepo=updates-testing update python-gssapi'. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2015-15121
python-gssapi-1.1.3-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.