I'm having a problem connecting to VPN on my Windows 10 (with Ethernet).
VPN fail description:
Can't connect to [my VPN]
The remote connection was not made because the attempted VPN tunnels failed. The VPN server might be unreachable. If this connection is attempting to use an L2TP/IPsec tunnel, the security parameters required for IPsec negotiation might not be configured properly.
I try ping to the server IP and successful: my cmd window
What confuse me is that the connection is good for half a year but fail recently, and the same configuration works fine on my OS X of laptop.
How could I solve it?