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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.

in Unable to connect to Flex 200 L2TP with Win 10 client since upgrade to 21H1 Comment by FordPrefect April 2022

All my L2Tp setting are the same. I tried different L2TP setting before without success. It could be something else on my laptop that breaks connection. ESET Security AV could be the offender. I currently don't have any other machine with 21H1 to try, so I would probably have to uninstall AV.

in Unable to connect to Flex 200 L2TP with Win 10 client since upgrade to 21H1 Comment by FordPrefect November 2021

Hi,thanks for suggestion. Unfortunately, it didn't work.I wanted to wait with results until today, because here at work I have access also to Win 10 2004 machine.On 2004 machine, connection is build correctly and it is working OK, so L2TP server settings on Flex 200 are correct.Om my laptop with 21H1, connection is dropped…

in Unable to connect to Flex 200 L2TP with Win 10 client since upgrade to 21H1 Comment by FordPrefect November 2021

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