If using SSL VPN check that the SSL VPN port on the router matches the one you are using on the Smart VPN client. For vigor routers this can be found on the [SSL VPN]>>[General setup] page. If the VPN is connecting but you cannot access the router or any resources (servers, email, etc.) behind it, check that the VPN client's LAN IP subnet does not match the subnet on the router as this would cause an IP conflict.

How to share your WiFi Connection with a VPN (Any OS with Mar 15, 2019 Smart DNS troubleshooting – CyberGhost VPN Loss of Internet connection once Smart DNS is in place. You can activate our Smart DNS service only for 1 IP address. Therefore, one of the main reasons you may lose the internet access with Smart DNS is that you have activated Smart DNS for a different IP address than the one of your device (PlayStation, Router, Nintendo, Smart TV, etc.). ASA - SSL VPN SMART TUNNEL - Cisco Community

Connect to a VPN in Windows 10 - Windows Help

ASA - SSL VPN SMART TUNNEL - Cisco Community Oct 13, 2009 How to Set up a VPN on Smart TV | Step-by-step [All TVs] Apr 16, 2019

Nov 05, 2019

Apr 11, 2018 VPN connection terminated, Smartcard Er - Cisco Community