Windows 10, 11 L2TP/IPsec connection problem
After the recent Windows automatic update, there is a problem that L2TP/IPsec connection is not possible. (Error 789)
This is a problem caused by Windows Update, and Microsoft says a fix update will be released soon.
For now, you can access it by uninstalling the problematic Windows update.
Open PowerShell as administrator and run the command below to delete the Windows update that is causing the problem.
In Windows 10: wusa /uninstall /kb:5009543
In Windows 11: wusa /uninstall /kb:5009566
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