The VON for my Linux distributions does not seem to work.
$ cat /etc/redhat-release
CentOS Linux release 8.0.1905 (Core)
Yes, I've tried entering all variations of the different VON commands into my server.cfg and experimented with different firewall settings to see if maybe something was blocking VON but alas.
There was also a post about this back in 2017 with no resolution and a different distro: