Random Mac Address On System Boot Seen by Fing Box

  1. Posts : 141
    Windows 10

    Random Mac Address On System Boot Seen by Fing Box

    Ever since the upgrade from Windows 1809 to 1909, around the beginning of January 2020, my computer produces a random generated mac address from my NIC (not wireless but wired) as seen by my Fing Box. The Fing Box monitors my network for suspicious activity as well as a slue of other features. Including the ability to auto block new wired and wireless connections on the network. I have used this device since its debut a couple years ago and it's never shown this issue before. What is happening is, when my computer boots up Fing notifies me of a new mac address and it is consistent with every boot. And then, only moments later it will disappear, Fing stating it was online for about a minute then it went offline. I first dove into the Fing community and even though there are some reports of this problem happening with other Fing users, I tried the supposed fixes and it has not worked for me, making me think it is an OS issue. As is I believe my OS is somehow for some reason creating a random mac address every time it boots. Here is what I have done so far to troubleshoot...

    1. Turned off virtualization in the BIOS and Windows features
    2. Disabled the onboard NIC and installed a 3rd party NIC
    3. Disabled all hyper v related services
    4. Tried a wireless adapter (which does not replicate the problem, only hard wired NIC's seem to cause the issue)
    5. Uninstalled onboard NIC drivers and installed original drivers from ASUS and newer drivers from realtek. Also used Microsofts drivers
    6. Disabled the onboard NIC which then fixes the problem but then no internet
    7. Ran virus scans using Malwarebytes and Windows Security
    8. Performed a Windows repair install

    I looked over mac address randomization within Windows and it appears to apply to wireless connections only the problem happens over wired connections. The randomly generated mac address's are always different and, do not match my NIC's actual mac address. And the problem does not seem to appear when waking the computer from sleep. It only seems to occur starting from a fresh boot. My network has not changed for a couple years now. I am using Google Wifi (mesh) with Fing Box and a couple unmanned switches.

    At this point any guidance would be helpful as to what I should do next. Thank you.

    - - - Updated - - -

    For anyone who is interested,

    The problem was with the beta desktop Fing software. It had installed a service called Fing.Agent. And when I removed the Fing software it did not remove the service. So I cmd "sc delete Agent.Fing" which removed the service, rebooted and now no more phantom mac address.
      My Computer

  2. Posts : 141
    Windows 10
    Thread Starter

    So the problem came back and I have found out what Windows service is causing it. It is the Windows Event Log. When that service is enabled, and I reboot, I get the phantom mac address. When I disabled it, the problem goes away. Now, when I disable Windows Event Log it states it also disables other services including...

    Windows Event Collector
    Network Connected Devices Auto-Setup
    Network List Service
    Network Location Awareness
    Net.Msmq Listener Adapter
    Message Queuing

    So I went through each one of these services and disabled one after the other. None of the above services toggle the problem. Only when Windows Event Log toggles the problem.

    So my questions is...

    Why would the Windows Event Log create a temporary phantom mac address that the Fing box would pick up on?

    Why is this happening now and it didn't happen on winver 1809?

    How can I leave Windows Event Log working without the Fing box flagging a new mac address every time I reboot my computer?
      My Computer


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