I was trying to bride the modem from the web http://www.speedtouch.ca/bridgemode.php, but it failed at the final step.
I set up a username and password, and use it for the final step, but it kept asking me to type the username and password, and it ends up everything got stuck. Then I make the modem Return to Factory Default Settings, I don't know what is the rationale behind that, but everything starts working fine now. I can open the websites that I could not open recently.
Thanks for all your help today.