Windows built-in L2TP/IPSEC VPN Client fails to connect when either side is behind a NAT firewall
In particular this can occur when connecting from Windows client to a Windows Server L2TP/IPSEC VPN (lol...)
To allow the client to connect in such situations, create a fixvpn.reg file containing:...
OpenVPN Troubleshooting
Peer certificate verification failure
OpenVPN Connect v3 client using a openvpn configuration for a Synology NAS running OpenVPN VPN Server cannot connect.
Errors: “Connection Failed. There was an error attempting to connect to the selected server"
"Error message: Pe...