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Recently, I got problem sign in to msn messenger (Key port -80048820 error), hotmail.com website and the internet speed is not stable on certain website. I am not sure what was going on to my ISP provider (StreamyX). It works fine previously. I got no problem accessing it in my working place. I got some friends staying nearby also having this problem.  After debugging with some try & error methods, I manage to solve this problem. This case may not apply to everyone depends on the network setting. For my case, I got an ADSL modem (with router) and D-Link Dir300 Wireless Access Point. Here are the steps:

• First I try to change the MTU setting from 1500 to 1362. Log in to D-Link administration system, click on Internet Setup, manual Internet connection setup, and change MTU setting under “Dynamic IP (DHCP) Internet Connection Type”. Then, restart your router, modem and PC. (It works for me for one night. After that, I try to use it on the next day, it give me the same error again).
• Second method, log in to D-Link administration system, click on Internet Setup, manual Internet connection setup and checked Access Point Mode. Restart your router, modem and PC. (Note, this will change your device to Access Point Mode and disable NAT mode – Get DHCP IP from your modem router.)

I hope these tips can give some hints to those who are having the same problem. It works for me! Good luck.