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Answer : This is caused by a change for security reason in kernel 3.18 [1]. There are two ways to fix this. First approach is adding this rule to the file /etc/ufw/before.rules before the line # drop INVALID packets ... -A ufw-before-input -p 47 -j ACCEPT Second approach is manually loading the nf_conntrack_pptp module. You can do this by running sudo modprobe nf_conntrack_pptp To load this module on every boot on Ubuntu, add it to the file /etc/modules . For more recent versions of ufw a solution is instead: sudo ufw allow proto gre from [PPTP gateway IP address] sudo systemctl restart ufw Add nf_conntrack_pptp to /etc/modules-load.d/pptp.conf One liner echo nf_conntrack_pptp | sudo tee /etc/modules-load.d/pptp.conf Explanation The accepted answer works for me, especially the 2nd suggestion--loading the nf_conntrack_pptp kernel module--as opposed to modifying my iptables firewall. My laptop firewall is otherwise unmodified. sudo ufw enable without excepti...

Answer : The download link for the Linux client from SonicWall is here. Go to that page, the follow the directions to log in to the Beta site as a guest (username is "demo", password is "password" - as provided on the page), then click the large NetExtender button, which will initiate a download of the latest .tgz file. Extract it and run ./install as root (using sudo ), then run the GUI. The installer has instructions to help you all along the way. As it was remarked that most links in the existing answers were dead and not much information was available, I thought to list below some resources that still exist: The NetExtender clients (and others) can be downloaded from the Clients Download page and installation notes are available in this Knowledge Base article. Here are the links from the above page: Linux 32-bits Linux 64-bits Windows .exe Some more useful articles : Ubuntu Linux: How to setup a VPN connection to a SonicWall router using Openswan and Pre-...