l2tpvpn

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Did you resolve the issue? I have exactly the same problem. The USG20 is behind an ISP router/gateway. I can get I2TP vpn from local network that the USG20 outside interface is connected. That should tell me the encryption settings are good, right?

in USG 20 L2TP VPN for Android / iOS - Phase 2 proposal mismatch Comment by l2tpvpn January 2020