We have again made the VPS up . The installation steps which you mentioned in the the link is changing the main configuration file on server. /etc/resolv.conf file is changed every time when you try to install the script mentioned in link. resolv.conf file is very important as it resolves your VPS. IF that file is changes, VPS will break down. Also I always see there is changes in network files too. So I always have to reboot the VPS and correct the configuration file to get VPS up.
We will suggest you to get a openvz vps instead of warp(xen) VPS. openvz is stable. So will suggest you to not execute that installation steps , because that will take down vps again .