Thank you for reaching out. After reviewing your account, we can see that your Roon Server is running on a QNAP HS-453DX and is currently on version 2.64 — which is no longer supported. Starting with Roon 2.65, the native QNAP package is no longer compatible, which is why you are experiencing connection issues.
To get back up and running, you will need to migrate to the Docker-based installation. Please follow our step-by-step guide here: Installing RoonServer on QNAP with Docker
A couple of important notes for the migration:
Make sure you have a recent Roon backup before proceeding — you will need to restore it after the Docker container is up and running
After the restore, check Settings → Storage and edit any music folder paths to match the new container volume mappings