Hey @PETER_CARTER,
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Just to clarify, are you receiving any errors when you open up Roon on the Mac? Or are you trying to connect with a remote but are unable to?
Thanks!