What was the solution to this problem. I too cannot get my Nucleus One to be detected by my router. I have tried all of the suggestions in this thread without success. I have extensive experience with networks and suspect the network adapter in my Nucleus One is faulty or the OS on the Nucleus is not configured properly. Either way, this server is worthless if I cannot connect it to my network. How do I resolve this problem???
Roon Server Machine
Networking Gear & Setup Details
Received my Nucleus One, but the Nucleus One will not connect to my network. Tried different cables and different ports on my Netgear RBR850 Orbi router. I am running the most recent firmware. Access control and VPN are not active on the router. Next to the ethernet port on the back of the Nucleus One, one light is solid orange and the other light is blinking yellow. It appears to me that the network adapter on the Nucleus One is defective.
Connected Audio Devices
Number of Tracks in Library
Description of Issue
If lights are blinking, one would think it has power? Does the power button have a light?
Power button and Power LED
– Press the power button once to turn on the unit or initiate a clean shutdown
– A dim white LED will be lit when the unit is powered on
– Hold the power button for 4 seconds to hard power off
From:
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SuedKiez - Yes, the unit is powered on. Should the lights be orange and blinking yellow. I tried hard powering the unit off and then turning it back on, but it still is not connected to my router.
On the network adapter, orange/yellow blinking should be fine and indicate normal operation. (Static orange/amber typically indicates Gigabit connection and flashing yellow network activity).
I was wondering whether the power button is also lit in white color. This should be here:
If yes, then there’s at least no obvious hardware issue. Can you connect the Nucleus by HDMI to a monitor or TV, ideally while still connected to the network? It should show some diagnostic output.
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I only have one subnet on my LAN (255.255.255.0). The WAN has a different subnet, but this should not have anything to do with the Nucleus One not connecting to my network. I cannot see the Nucleus on my network so I cannot use the webUI. Below is the screenshot when I plug a monitor directly into the Nucleus One. It appears to me that the Nucleus is not booting up completely and that is why I cannot see it on my network.
I connected a keyboard using the USB connection and type “exit” at the prompt, the Nucleus boots up and I can see the Nucleus on my network. Everything works perfectly, but if I turn off the Nucleus, it hangs again at the prompt per the screenshot in my previous message. I have the Nucleus working for now, but I need a better solution so that I do not need to connect a monitor and keyboard (or at least a keyboard) every time I turn off the device to type the word “exit”.
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Hi @CBerry,
Thank you for the prompt response and screenshot!
If you could, bring your Nucleus back online and allow our servers to connect to it, we’ll see about enabling diagnostic mode for the device for further investigation.
Alternatively, you can also use the directions found here and send over a set of Nucleus logs to our File Uploader.
Thanks so much for your help. It looks like the Nucleus is not booting up completely. I connected a keyboard and monitor to the Nucleus. It hangs during bootup. If I type “exit” at the prompt, the Nuclues completes the bootup process and works perfectly. I am waiting for a response from Roon Support on how to fix the bootup problem.
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The Nucleus is up and running now. Works great unless I restart it.
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Yeah I guess that’s how it has to be 
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Really bad customer service. Why do we need to fill out a form to get replacement units? I am embarrassed for Roon and Harmon. This is no way to run a company. Especially when Roon’s users are more discerning than the average consumer and word travels fast when a company makes their early adopters jump thru hoops when your product is obviously defective. I have spent several hours trying to diagnose the problem with your low quality product and now you want us to fill out another form to get a replacement unit. Absolute ridiculuos!!!
Hi @CBerry,
Thanks for creating a separate report for your issue - if you can, please keep your issues tied to this thread moving forward for tracking purposes. I’m again sorry you’re experiencing issues with your new Nucleus One.
With that, I’d also triple confirm your Nucleus is on the same local subnet as your other network devices. This information lives within your router settings under the device list. Based on your previous comment:
You’re referring to the subnet mask, which is correct - I’d also confirm the IPs are all within the same subnet as well.
Lastly, as mentioned in the other thread, if you do want to return the device, you can either start an RMA, or log into your Roon store account to begin the return process.
- Log into the Roon Store using your account.
- From the “Returns” section, select the product(s) to be returned.
We’ll be monitoring the thread for your reply. Thanks! 
Yes. The Nucleus is on the same subnet as all of my other devices. In fact, the Nucleus has been working perfectly for the last two days since I plugged in the Nucleus to a monitor and discovered the Nucleus was hanging up during boot up. I would prefer to not return the Nucleus and wait for a replacement if I can fix the issue thru the CMOS or by reinstalling the OS, but need feedback on the issue based on the previously posted screenshot. I have initiated the RMA just in case, but again would prefer to fix my current unit and not return and wait for a replacement.
Thanks for the report @CBerry, our team is looking into your case further and I should have more information to share soon. I’m glad to hear things have been functioning properly otherwise! 
Hi @CBerry,
As a next step, we’ll want to change the BIOS settings on the Nucleus to disable a function that will allow the Nucleus to boot properly. This isn’t normally something that needs to be done manually, it’s an odd case, but it should set you up for proper functionality.
First, if Roon Server is running, safely stop it - you can do so from the webUI of the Nucleus:
After that, set up your monitor and USB keyboard again, and follow the below steps:
- Press F2 during start to enter BIOS setup.
- Go to Advanced > Boot > Boot Configuration.
- In the Boot Devices pane, disable Internal UEFI Shell.
-
- Press F10 to save changes and exit BIOS Setup.
- Reboot your Nucleus normally, and you should be all set
Let us know how the above goes, and if you have any questions along the way!
(Note that our team doesn’t work weekends, but we’ll be back first thing Monday morning)
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