: Fixed typo, that L2TP uses UDP, not TCP With IPSec to establish a Virtual Private Network (VPN). Layer Two Tunneling Protocol (L2TP) uses TCP port 1701 and is an extension of the Point-to-Point Tunneling Protocol. Adjust your rule to allow the TCP port 1701 through as well and see if that fixes the problem. It seems perhaps in some configurations port 1701 is used over TCP and UDP both and not just UDP only.Remove-ItemProperty -Path "HKLM:SYSTEM\CurrentControlSet\Services\PolicyAgent" -Name "AssumeUDPEncapsulationContextOnSendRule" –Force # - Remove registry key for L2TP communications support via double NAT ![]() Note: You must run this in an admin elevated PowerShell session. A value of 2 configures Windows so that it can establish security associations when both the Windows Server and Windows VPN client computer are behind NAT devices.Important: You must restart the machine(s) you apply this to before it's effective.Ĭreate and configure the AssumeUDPEncapsulationContextOnSendRule registry key with a 2 value beneath HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent registry subkey and define it as a DWORD value. Set-ItemProperty -Path "HKLM:SYSTEM\CurrentControlSet\Services\PolicyAgent" -Name "AssumeUDPEncapsulationContextOnSendRule" -Type DWORD -Value 2 –Force # - Add registry key to support for L2TP communications via double NAT The advice given by Microsoft "if you have to put a server behind a NAT device and then use an IPsec NAT-T environment, you can enable communication by changing a registry value on the VPN client computer and the VPN server." Trouble getting Windows to connect to an L2TP VPNįirstly, if the VPN server is behind a NAT and the VPN client is behind a NAT this could cause a problem because apparently "by default Windows does not support IPSec network address translation (NAT) Traversal (NAT-T) security associations to servers that are located behind a NAT device", and this applies to Windows 10 still as well.
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