Did you set up a static IP address first? Is the firewall icon still there? If it is, you might have missed something out with your port forwarding. Did you make sure that LW's listening port & your port forwarded were the same number? That number also has to go into the manual port forward box in LW's tools > options > advanced > firewall config.

Does your cousin connect from your house? If they don't, it still could be that your problem is ISP related as lots of people in Thailand using Streamyx can't connect but some people using the same ISP can connect. It was just a thought that the quake might be effecting some people's connections.