FIX: The L2TP connection attempt failed because the security layer encountered . (Solved)

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"The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer".

How to FIX: KB5009543 & KB5009566 updates breaks L2TP and IPSec VPN Connections. *
* Update (January 18, 2022): According Microsoft the issue is resolved in KB5010793 update for Windows 10 and in KB5010795 for Windows 11. So proceed to download and install the corresponding update from the Microsoft Update Catalog and see if the issue is fixed. (if not, then apply the steps below)

LINK IN MOVE ( for windows 10 ) :

LINK IN MOVE ( for windows 11 ) :
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