Description of problem: Removing GSSAPI credentials on logout causes severe system because Fedora 20 uses persistent GSSAPI keys. These keys are shared between sessions so exiting one session will remove unrelated GSSAPI credentials of other sessions. This renders the system unusable because e.g. access to NFS4 blocks or login tasks fail. The GSSAPICleanupCredentials must be set to no hence. Things worked well in previous Fedora versions because persistent GSSAPI keys were not used there. Version-Release number of selected component (if applicable): openssh-6.4p1-3.fc20.x86_64
Perhaps there should be proper reference counting on the shared persistent keys done by the kerberos library. However until this is implemented setting 'GSSAPICleanupCredentials no' is a reasonable workaround.
openssh-6.4p1-4.fc20 has been submitted as an update for Fedora 20. https://admin.fedoraproject.org/updates/openssh-6.4p1-4.fc20
Package openssh-6.4p1-4.fc20: * should fix your issue, * was pushed to the Fedora 20 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing openssh-6.4p1-4.fc20' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-6380/openssh-6.4p1-4.fc20 then log in and leave karma (feedback).
openssh-6.4p1-4.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.