PPTP VPN on Ubuntu 8.04? - Virtual Private Networking
Oct 14, 2009 Connect/disconnect from VPN from the command line - Ask Ubuntu Using the commands above with sudo should work for most connections, but VPN specifically might fail with "Error: Connection activation failed: no valid VPN secrets." If that happens to you, it's likely that the VPN password is stored in your user's gnome-keyring, which makes it inaccessible to the root user. This comment explains why. PPTP VPN in ubuntu cannot connect - Ask Ubuntu Based on output allow traffic from vpn server to your pc on port 47.. PPTP user gre (Generic Routing Encapsulation) protocol. This protocol uses vpn server and send udp packets to your pc on port 47.Without this protocol pptp connection is not possible.. sudo ufw allow proto udp from 199.101.117.111 port 47 to 192.168.2.120 port 47
VPNTunnel: PPTP Installation Guide for Ubuntu 18.04
Connect/disconnect from VPN from the command line - Ask Ubuntu Using the commands above with sudo should work for most connections, but VPN specifically might fail with "Error: Connection activation failed: no valid VPN secrets." If that happens to you, it's likely that the VPN password is stored in your user's gnome-keyring, which makes it inaccessible to the root user. This comment explains why. PPTP VPN in ubuntu cannot connect - Ask Ubuntu
android - VPN PPTP - GRE: Bad checksum from pppd - Stack
android - VPN PPTP - GRE: Bad checksum from pppd - Stack Also, make sure that the network firewall permits TCP traffic on port 1723. Both of these conditions must be met to establish VPN connectivity by using PPTP. If you are using Arno's IPTables Firewall, enable the plugin for PPTP then. Hope it could solve the problem.