https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/clients.md#windows-error-809

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent]
"AssumeUDPEncapsulationContextOnSendRule"=dword:00000002





Add-VpnConnection -Name 'CP-VPN' -ServerAddress 'vpn.myrightone.com' -L2tpPsk 'hzxiaoyukeji' -TunnelType L2tp -EncryptionLevel Required -AuthenticationMethod Chap,MSChapv2 -Force -RememberCredential -PassThru