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Constant Ethernet Disconnects

Anonymous
Jan 29, 2025, 2:44 AM

Hello,

I am having an obscure issue with Ethernet connectivity. “Realtek Gaming 2.5GbE Controller is reset by tx hang”. Connection cuts for 5 seconds or so then comes back, sometimes doesn’t come back.

Source rt25cx21 Event ID 9

This is actually a new symptom to this issue I have been dealing with for over a year. Ethernet randomly disconnects. I thought I fixed it by updating to an old driver (thought it was more stable). Then I thought I fixed it by disabling my ISP router firewall (Xfinity advanced protection was showing connections blocked to my PC). Now I don’t know what the issue is.

Symptoms include

-sudden loss of Ethernet

-have to reset adapter or PC

-sometimes adapters will completely disappear and will eventually come back after multiple power offs

-event viewer errors for DNS Clients

-event viewer errors for tx hang reset

Windows for home | Windows 11 | Internet and connectivity

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  1. Anonymous
    Jan 29, 2025, 8:11 PM

    Hi ChrisSeiden

    Welcome to the Microsoft Community

    Understanding of your problem, Ethernet continuous disconnection

    Updating Drivers

    Even though you have tried older versions of drivers before, it is better to use the latest stable version. You can download the latest driver from Realtek's official website or your motherboard manufacturer's official website.

    Power Management Settings

    Make sure your NIC is not affected by the power management mode. Here are the steps to do so:

    Open Device Manager (you can search for “Device Manager” in the Start menu).

    Locate the network adapter, right-click on your Realtek 2.5GbE controller and select Properties.

    In the Power Management tab, make sure the “Allow computer to turn off this device to save power” option is unchecked.

    Network Configuration

    Check that your network configuration is correct:

    Ensure that your IP is configured as “Auto-acquire”.

    Try to set up a DNS server manually, e.g. use Google's public DNS (8.8.8.8 and 8.8.4.4).

    Router and cable check

    Get a new network cable to make sure it's not a problem with the cable.

    Make sure your router firmware is up-to-date and there are no unusual settings affecting your network connection.

    Network adapter reinstallation

    Uninstall the driver for your Realtek network adapter in Device Manager, then restart your computer and let Windows reinstall the driver automatically.

    BIOS update

    Update your motherboard's BIOS, as some BIOS updates may contain compatibility and stability fixes for your network controller.

    Reset Network Configuration

    You can try to reset the network configuration, you can follow the steps below to perform a network reset:

    Press Windows + R, type cmd and press Enter to open the Command Prompt.

    Type the following command and press Enter:

    netsh winsock reset

netsh int ip reset

ipconfig /release

ipconfig /renew

ipconfig /flushdns

    Restart the computer.

    Virus scan or malware check

    Make sure your system is not affected by viruses or malware by running a full antivirus scan.

    If none of the above resolves the issue, you may want to consider replacing the network adapter hardware or using a USB network card as an alternative to see if the same issue occurs again.

    Contact me if you need anything else.

    Best wishes

    Merek.Z - MSFT | Microsoft Community Support Specialist

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