Have your tried rebooting everything? Including your network equipment?
I’ve moved your topic to the Support category of the forum, where it will be seen, and responded to, by a member of the Support team.
In order for Roon’s @support team to better assist you, please provide a brief description of your current setup and the nature of the issue using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so they have a clear understanding of how your devices are connected.