Fix L2TP VPNs on Windows 7/8/10/2008/R2/2012 : Oxygen IT Solutions

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Modified on: Fri, 26 May, 2017 at 10:39 AM

On your Windows machine change or add the following registry item:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent\

DWORD (32-bit)

"AssumeUDPEncapsulationContextOnSendRule"

Set the value to 2

This allows the client or server to be behind a NAT firewall.

Make sure you reboot after this change

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