Tcpip 4205 Event Warning since new router & ISP switch!

  1. Posts : 332
    Windows 10 Pro 64-bit

    Tcpip 4205 Event Warning since new router & ISP switch!

    Ever since I switched to a new ISP TalkTalk here in the UK that uses the Wi-Fi Hub (Sagemcom F@st 5364).

    Now I am not using Wi-Fi at all, only Ethernet cables. I reset the network adapter, but this warning appears all the time since pretty much the day of my ISP switch.
    Tcpip 4205 Event Warning since new router & ISP switch!-tcpip-4205-event-warning-since-new-router-isp-switch.jpg
    How do I get rid off this issue? It is not affecting my internet use or performance. Windows 10 Pro Version number 1903.
      My Computer

  2. Posts : 8,219
    windows 10

    Open a cmd prompt type

    route print

    post results
      My Computer

  3. Posts : 332
    Windows 10 Pro 64-bit
    Thread Starter

    I seemed to have found out the reason for this!
    Turning off IPv6 from Control Panel\Network and Internet\Network Connections --->Properties ---> Internet Protocol Version 6 uncheck the box restart PC.

    Over 4 hours and this warning has no longer shown up.

    Now I suspect that the reason for this is that TalkTalk and its WiFi Hub does not support IPv6 which is why this is happening. With Plusnet and Sky previously this never happened because they support IPv6. There seems to be no TalkTalk mentioned, now I don't know whether that is the reason, but it most likely is. Because before the ISP migration this warning has not showed up ever in my Windows 10 system!
    IPv6 test - Statistics for United Kingdom
      My Computer

  4. Posts : 332
    Windows 10 Pro 64-bit
    Thread Starter

    I can confirm that turning off IPv6 has indeed solved this issue. I have no idea what it is, but definitely TalkTalk and new router is the cause of this!

    I have also checked out of curiosity my dads computer that has Windows 8.1 and his Event Viewer also has these TCPIP 4205 Event Warnings. Something that has never shown up previously with Plusnet ADSL and a different Sagemcom router named plusnet 2704n router - adsl.

    TalkTalk WiFi Hub Router (Sagemcom F5364) has caused this warning. No other computer symptoms or issues. I am getting very good Fibre speeds 80 Mbps Download 20 Mbps Upload achieving max speeds. Of-course this may be irrelevant from the issue that I am speaking of. But I do wonder why with new provider and router this warning is coming and why turning off IPv6 stops these warnings from popping in the Event Viewer.

    As long as IPv6 is unimportant then I guess turning it off is the solution for now.
      My Computer


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