L2TP VPN on Windows 10 only connects with Firewall disabled

by Panomosh   Last Updated September 11, 2019 10:01 AM

I have configured an L2TP VPN on Windows 10. To get it working in the first place I have had to add the "AssumeUDPEncapsulationContextOnSendRule" registry Key, and when the Windows Firewall is totally disabled, the VPN connects perfectly.

I cannot get the VPN to connect with the Windows Firewall enabled at all. I have allowed protocol 50 (ESP) in and out, I've also allowed UDP 1701, 4500, 5000 in and out, however the VPN will still only connect if I totally disable the windows firewall.

Has anyone else come across this issue?`

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