Unable to connect to Flex 200 L2TP with Win 10 client since upgrade to 21H1

FordPrefect · 2021-11-05 09:17:49

Hello, since I upgraded Windows 10 to 21H1 a week ago, L2TP connection to my Flex 200 stopped working.Before, I had Win 10 2004 and everything was ok.I search Google and found several similar problems (started with Win 10 20H2, which I didn't install), but no solution.I also searched Zyxel forums and read many articles,…

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FordPrefect Posts: 5 Freshman Member

April 2022
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To answer my own question, it was MS bug, introduced with MS updates for Windows 10. It broke many L2TP VPNs.
More info here.
Solution is to install KB5010793. It is an optional update, so installation depends on settings.

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