Permanent connectivity issue with Roon Nucleus (ref#OF77HF)

[Richard_Kraus]

Is Roon Server running?

· No, Roon Server is not running.

For Roon connectivity to work properly, both Roon Server and Roon Remote need to be turned on.

· I can't turn on Roon Server, I need help.

Describe the issue

Cannot connect to Roon Nucleus. Problem was intermittent, now permanent. Roon site offers many tips, but all presume you can connect.

Describe your network setup

Arris router, mesh network, ethernet to nucleus. Network works fine for TV, streaming from Qobuz

[vadim]

Hello Richard,

Thank you for reaching out. If you cannot connect, the first step is to check whether the Nucleus is accessible on your network at all.

Please try the following:

1. Find the Nucleus IP address
   • On the Arris router web interface, look for a device named Nucleus or something listed under DHCP leases.
   • If you know the IP already, proceed to the next step.
2. Open the Nucleus Web Administration Page
   • In a browser, go to: http://<Nucleus_IP>
   • Example: http://192.168.1.25Send us a screenshot of that page, especially the status of:
   • Operating System
   • Roon Server Software

Also, please confirm the following:

• Is the power LED on the Nucleus solid or blinking?
• Is the Ethernet cable connected directly to the router or to a mesh satellite node?
• If possible, temporarily connect the Nucleus directly to the main router, bypassing the mesh node, and restart it.

These details will tell us whether the issue is:

• Roon Server not starting,
• Network path issue through the mesh,
• Or a hardware-level fault.

Once we have the screenshot and answers, we’ll advise the next step.

[Richard_Kraus]

Hi Vadim,

I have been unable to connect to my Arris router. It does handle all non-Roon traffic OK.

I connected my nucleus directly to the router, bypassing the mesh. Stlll no joy.

Power LED is solid, not blinking.

Dick Kraus

[benjamin]

Hey @Richard_Kraus,

Thanks for giving that a try! A good next step in this case would be to now plug your Nucleus into a monitor via HDMI (while keeping it connected to your router) and share a screenshot of what you see.

Let me know if this makes sense and if you have any additional questions!

[Richard_Kraus]

Thanks, Benjamin.

[noris]

Hello @Richard_Kraus ,

Just to confirm, you’ve tried to perform a full reboot (power off, unplug, wait 30s, plug back in), for both your ROCK and all your networking gear?

Do you by any chance have a USB → Ethernet adapter around the house or can purchase one (they are usually less than $15)? If so, can you please try to use that instead of the on-board Ethernet port?

You can also try to perform a network reset command by using a USB keyboard, this may help:

Reset network settings on RoonOS

Let us know how this goes!

[Richard_Kraus]

I bought a usb>ethernet adapter and Roon is working again. Thanks for the tip for this workaround.

So I now have a new nucleus with an important hardware failure. It is under warranty (purchased July 6, 2025). How do I get a replacement?

Richard Kraus

[benjamin]

Hey @Richard_Kraus,

Excellent work in troubleshooting here! Yes, you are correct - lets get the return process going asap so you can get back to your music.

The best next step here is to get in touch with our RMA department directly, as they’re in charge of all hardware-related Nucleus issues. To do so, open the Typeform link below and select ‘Other’ followed by 'This issue is related to a physical component".

Typeform link : Nucleus Troubleshooting

Screenshot for reference:

They’ll help get you sorted out moving forward. Thanks!