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
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?`