Thank you for your post. We’ll need a little more information in order to ensure we provide accurate troubleshooting steps here.
Diagnostics indicate that your Nucleus+ is on an outdated Roon build, 1646, instead of the latest available version. A build mismatch between server and the remote is a common cause for connectivity issues, so the first step would be to update to the latest available Roon version. If you’re unable to open and connect to Roon itself on a remote, you can reinstall RoonOS from the web admin page in a browser instead to automatically force the machine to the latest available Roon update.
From there, please share a screenshot of the Nucleus web admin page itself.
Just checking in on this, as it looks like you were able to update the Nucleus+ to the latest version. Can you confirm you are still experiencing issues following the update? Thanks, and let us know if you have any questions.