Jul 10, 2020 · The network connection between your computer and the VPN server could not be established because the remote server is not responding. This could be because one of the network devices (e.g., firewalls, NAT, routers, etc.) between your computer and the remote server is not configured to allow VPN connections.
Mar 29, 2017 Can't connect to L2TP/IPSec VPN Server - Synology Forum Mar 21, 2017 These are the most common errors with the Windows 10 Aug 07, 2015 VPN-not working since update 22.20.1.69 "connection Feb 04, 2020
If you have tried many thing other people suggest like rebooting, reloading hardware and re-installing the VPN or dial in connection, you still get the same problem. I will suggest to check the router settings and make sure TCP Port 1723, IP Protocol 47 (GRE) are opened.
Jun 03, 2017 Solved: Meraki VPN Client - The Meraki Community Nov 23, 2017 Unable to connect to NAS via PPTP VPN - Synology
Jan 15, 2020
Fix VPN 868 Error on Windows - YouTube