By default, Windows 10/11 does not allow IPSEC connections behind a NAT.

  1. Open Regedit and navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent
  2. Under the edit menu select new DWORD (32-bit) Value.
    • Type AssumeUDPEncapsulationContextOnSendRule and hit enter.
  3. Right Click AssumeUDPEncapsulationContextOnSendRule and select Modify.
  4. In the Value Data box type the value of 2 to allow VPN connections when the Server and Client are located behind a NAT.

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