If you are using Apple Devices (iPhone, Mac, etc.): Check "Send All Traffic" has been enabled....Turn on VPN Passthrough of Your Router
Find below the link of guides from different router brands: TP-Link LinkSys...VPN 619 Error on Windows
Please follow the following steps: Turn off all firwalls and antivirus software. Turn on VPN...VPN 800 Error on Windows
Switch from PPTP to L2TP mode Chech your router has enabled "VPN Passthrough": Find below the...VPN 809 Error on Windows
Please follow the directions of this document from Microsoft:...