all ISPs in Singapore make you access internet through a proxy
server. It is this proxy server's IP address that is causing you
the problem.
For your proxy IP, please go to http://www.showmyip.com/, and scroll
down to the section on "Proxy properties". That "proxy IP" is your
IP address as the rest of the internet knows it.
You "actual" IP address is only an internal IP used by the singnet
server to keep track of where to forward the data from the proxy
server from. To the rest of the internet you don't exist at your
"real" IP, only the proxy IP matters and that's why you are
unfortunate to be blocked because of a vandal who was/is sharing
the proxy server with you.
