Unable connect Windows 10 to Mikrotik L2TP/IPsec behind NAT – Solved

Open regedit (Windows + R -> regedit -> enter) find key : Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent.

Create new DWORD value with name : AssumeUDPEncapsulationContextOnSendRule and value 2

Restart PC and enjoy the L2TP/IPsec without problems.

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