[For VPS administrators with older operating system versions. - personally, I needed this for a Debian 7-32bit situation.]
please execute these commands via SSH:
mkdir -p /dev/net
mknod /dev/net/tun c 10 200 (note: after issuing this command you may get a "file exists" error - disregard and move on.)
chmod 600 /dev/net/tun
That's it. TUN/TAP module is activated.