Cinnamon desktop network manager running on CentOS 7 reports incompatibility with system network services after system recent updates. Error message is "The system network services are not compatible with this version." Gnome and KDE network managers work fine. Yum reports latest Cinnamon package (cinnamon-2.0.14-19.el7.x86_64) is installed. Same issue discussed in Arch forum at https://bbs.archlinux.org/viewtopic.php?id=192939. Cinnamon package appears to have been updated per https://github.com/linuxmint/Cinnamon/issues/3940 and https://github.com/linuxmint/cinnamon-control-center/pull/107. Cinnamon package in epel repository may require corresponding update.
cinnamon-control-center-2.0.9-7.el7 has been submitted as an update for Fedora EPEL 7. https://admin.fedoraproject.org/updates/cinnamon-control-center-2.0.9-7.el7
Package cinnamon-control-center-2.0.9-7.el7: * should fix your issue, * was pushed to the Fedora EPEL 7 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=epel-testing cinnamon-control-center-2.0.9-7.el7' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-EPEL-2015-5746/cinnamon-control-center-2.0.9-7.el7 then log in and leave karma (feedback).
cinnamon-control-center-2.0.9-7.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.