troubleshooting – Turning off one computer causes problems on entire network


One of the Windows PCs on my home network has recently started causing network problems. I will refer to this PC as the “problem pc”.

The last thing I did to the problem pc before the issue started was a complete re-install of Windows on a freshly re-formatted drive. I have no way to ‘rollback’ the re-install to see if it fixes the problem.

When the problem PC is shut down, all devices connected via ethernet on my network lose the ability to access the internet. Web pages won’t load at all. Additionally, traffic within my home network becomes very slow. (for example, copying a file to or from my Synology Diskstation NAS)

Devices connected via Wi-Fi are not affected.

Notes:

  1. The problem occurs any time the problem PC is plugged in, but not booted up
  2. The problem will clear up if I do any of the following to the problem pc:
    a. physically remove power (unplug)
    b. Press the power button to start it back up. The problem resolves almost instantly (i.e. well before the PC is fully booted up)
    c. disconnect the ethernet cable
  3. The problem PC is not
    a. sharing its internet connection
    b. running a DHCP server (or any other kind of server software)
    c. running any VMs
  4. I’ve done all of the following to the problem pc:
    a. disabled “Fast Boot” in UEFI/BIOS
    b. disabled “Fast startup” in Windows “Power Options”
    c. disabled “Allow this device to wake the computer” in the NIC’s Power Management settings

Thanks in advance for any help you can provide!


Here are some screenshots from the problem PC:
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Here are screenshots from a second PC on my network, while the issue is occurring:
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Running Windows Network Diagnostics on the second PC, during the outage,results in the following recommendations. Executing these steps does not solve the problem.
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