I have two USG v5.5.24 at two client offices. Site-2-Site VPN tunnel is up, working fine and has been for 2 months. This client also requires several client-site VPN for traveling laptops. I have everything setup according to UBNT documentation, user provided documentation etc. USG is activing

VPN error ID: 809 - VPN Connection Blocked | Norton Community Mar 10, 2017 How to Fix Client and Server-Side VPN Error 800 Nov 15, 2019 Connecting L2TP/ IPSec VPN Server Behind a NAT, Error Code 809 May 14, 2018 Troubleshoot Azure point-to-site connection problems

VPN L2TP/IPsec problem on Win client, error 809 - Cisco

VPNエラー809 は通常、クライアントとサーバーの間のファイアウォールが、VPNトンネルが使用するポートをブロックしているときに発生します。 さらに、デフォルトでは、WindowsはNATデバイスの背後にあるサーバーへのIPsec NAT-Tセキュリティアソシエーションをサポートしません。 Windows 10の一般的なVPNエラーコードのトラブルシューティ …

Oct 10, 2019

Jul 20, 2016 Windows L2TP users cannot connect, Windows shows error 809 On the Windows machine, open the registry and add/edit the following property: Login to the Windows machine as Admin. Go to 'Start > Run' and type regedit. Server Unavailable – IPVanish The vpn service is not connected properly. Try reconnecting using a different VPN protocol. When a VPN connection is established, you should have both Internet access and a different IP address. Check your IP address on our website before you connect, and then check it again afterwards. They should be different.