Comment # 2 on bug 956558 from Dieter Jurzitza

An IMHO related issue: nfs-utils require gssproxy in their systemd - files,
however, gssproxy is not offered by any package.
This is causing continuous error messages from systemd, filling logs.
The same holds true for nfs-server.service 

nfs-client.target
nfs-server.service
rpc-svcgssd.service

all refer to gssproxy.service