The version of TurboVNC in the yum repository from Open Ondemand (https://yum.osc.edu/ondemand/1.6/compute/el7Server/x86_64/) is a bit outdated.
It now hosts version 2.1.1 which contains a nasty bug where it fails to start VNC. We hit it at our site.
for reference the bugreport: https://github.com/TurboVNC/turbovnc/issues/136
and the fix: https://github.com/TurboVNC/turbovnc/commit/c8bdb849ffd289e89189ca0c7f779dee9a9396e7
It should probably be updated to a newer version (2.2.3) so that people/new users who rely on the repo don’t get hit by it. Would that be possible?