Why does my PC only partially detect Ethernet, Network bug on Windows 11 and Ubu...

This is a crosspost from the same question I posted on Reddit here, but the problem is extremely strange.

Hi everyone,

This is one of the most baffling bugs I've come across. I’m dealing with an extremely strange ethernet network failure on a dual-boot setup (Windows 11 / Ubuntu 24.04 LTS) on a Microcenter PowerSpec G453 PC (1 year 4 months old) and could really use an expert perspective. I can work normally on WiFi.

On Windows 11:

1. Only Google-owned sites (Google, YouTube) load in the browser. Reddit, Discord, and all other standard sites fail to load.

2. Running ping 8.8.8.8 or ping 1.1.1.1 returns: PING: transmit failed. General failure.

3. Running ipconfig /renew hangs indefinitely at Windows IP Configuration.

4. Attempting to start/restart DHCP Client in services.msc yields: Error 5: Access Denied.

Ubuntu 24.04 LTS:

1. Completely offline. Has no internet connection at all.

I've tried the following on Windows' software and network stack:

1. Stack & Proxy Reset: Executed netsh winsock reset, netsh int ip reset, ipconfig /flushdns, ipconfig /release, and netsh winhttp reset proxy.

2. Built-in Reset: Used Settings > Network & internet > Advanced network settings > Network reset.

3. Registry ACL Restores: Restored Full Control permissions to HKLM\SYSTEM\CurrentControlSet\Services\Dhcp, Tcpip, and Nsi\{eb003100-835b-11d1-91a3-0000f87571e3}\26.

4. Service Fixes: Re-registered dhcpcsvc.dll and ran Firewall resets via netsh advfirewall reset.

5. System Files: Passed both DISM /RestoreHealth and sfc /scannow.

6. Hardware & Networking: Reinstalled network drivers in Device Manager. Power-cycled the router completely. Verified no virtual adapters or third-party NDIS filter drivers are bound to the interface (ncpa.cpl). Replugged ethernet cable in and out of my router. I should mention that I use an extender (from Verizon) to get ethernet, the main router is a floor below my PC room. Usually it takes ~2-3 minutes to get ethernet on either OS after booting.

Some context about recent changes:

1. I plugged in a new Logitech Pro X Superlight 2 mouse yesterday.

2. My LG UltraGear monitor suddenly died (this is twice in the past year now), so I unplugged it, waited, and replugged it into the wall socket, and it worked. But while it was unplugged I forcibly shut off my PC twice holding the power button down. Once in Ubuntu and once in Windows (Ubuntu first).

3. The PC was working normally until about 5 hours ago, then it suddenly degraded.

4. I forcibly uninstalled Microsoft Copilot, which had installed itself without my consent on Windows 11.

Because Ubuntu is completely offline and Windows is dropping TCP/ICMP while passing UDP/QUIC, this seems like a low-level hardware PCIe state lock (e.g., Fast Startup / Power Management corruption), an MTU mismatch, or a router-level ARP/filtering block on my MAC address. Has anyone seen a NIC or router get stuck in a state where only UDP/QUIC succeeds while standard TCP and ICMP fail across both Linux and Windows? Any recommendations on what to try next?

Given that this is impacting both OSes, this is unlikely to be a driver issue. While DavidGo says it is not a Router issue, it is probably worthwhile connecting to a different internet router just to see.

Assuming this IS an issue local to your computer, and knowing it is not a driver issue, that leaves you with the following steps:

1. Update all possible system firmware. This will include BIOS/UEFI but should include any other available firmware updates for all your system components, especially mainboard components and your NIC.
2. Reset your system firmware to defaults, then reconfigure to any required settings.
3. Connect and use a USB NIC dongle. These are cheap and easy to use.