News, tips, advice, support for Windows, Office, PCs & more
Home icon Home icon

We're community supported and proud of it!

  • New Windows KB5009543, KB5009566 updates break L2TP VPN connections

    Home » Forums » Networking – routers, firewalls, network configuration » New Windows KB5009543, KB5009566 updates break L2TP VPN connections

    • This topic has 0 replies, 1 voice, and was last updated 2 weeks ago.
    Author
    Topic
    #2418066

    https://www.bleepingcomputer.com/news/microsoft/new-windows-kb5009543-kb5009566-updates-break-l2tp-vpn-connections/

    Windows 10 users and administrators report problems making L2TP VPN connections after installing the recent Windows 10 KB5009543 and Windows 11 KB5009566 cumulative updates.

    After installing yesterday’s updates, Windows users find their L2TP VPN connections broken when attempting to connect using the Windows VPN client.

    When attempting to connect to a VPN device, they are shown an error stating, “Can’t connect to VPN. The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer,” as shown below…

    The bug is not affecting all VPN devices and seems only to be affecting users using the built-in Windows VPN client to make the connection.

    • This topic was modified 2 weeks ago by Alex5723.
    Reply To: New Windows KB5009543, KB5009566 updates break L2TP VPN connections

    You can use BBCodes to format your content.
    Your account can't use all available BBCodes, they will be stripped before saving.