Hi Paul, not official support, but, have a suggestion. When a remote cannot connect, and you get to a screen with a little blue Help link. If you click the link, it will allow you to enter the IP of your core. Instead of the actual IP, use 255.255.255.255 and see if that helps with the connection issue.
I’d post a screen pic, but, currently not at my desk.
Anyway, I have also moved your post to support, so, official Roon support techs can help.
Thanks daniel all help is appreciated and that’s handy to know, hope I can return the favour one day.
I’ve just solved the issue even though nothing has changed it turned out to be a firewall issue, not surprising really. There was a second roonappliance.exe appearance in the list of allowed apps and features.
I configured everything roon to be allowed in both public and private instances and now all is working as before.