If you've set a static IP on a RoonOS Server (ROCK/Nucleus) that is no longer accessible on your network you can resolve this by resetting the network settings on your device. You can do so by following these instructions:
- Connect the Nucleus to a monitor or TV via HDMI
- Connect a USB keyboard to the Nucleus
- Press ENTER
- Type resetnetwork
- Press ENTER
All network settings will now be reset and you can try connecting to the server once more.