Error 789 when attempting to connect L2TP vpn connection
Microsoft released security updates KB 5009543 for Windows 10 and KB5009566 for Windows 11 which caused signification issues with L2TP vpn connections. While the initial work around was to uninstall the security updates to resolve the issue, the updates would eventually reinstall within a couple of days. Microsoft has since released an update to help resolve the issue. Security update KB 5010793 for Windows 10 and KB 5010795 for Windows 11.
You can download the updates from their respected Update Catalogs below:
Select the appropriate version for your computer.
After you click the download button, a new window will appear with a download link. If you click the link and nothing starts to download, please right click on the link and select ‘Save link as …’. Once the download has completed, double click to install. A reboot of the computer is necessary to complete the installation.
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