If disabling SPI did not do the trick you may need to adjust your MTU settings.
MTU adjustment
1. Access the web-based utility of the router.
a. Please open any web browser like Internet Explorer or Netscape Navigator.
b. Connect to the router by typing http://routerlogin.com/basicsetting.htm or http://192.168.1.1 in the address field and click Enter or Return key.
c. For security reasons, the router has its own user name and password. When prompted, enter admin for the user name and password for the password, both in lower case letters.
Note: If it does not take password as the password, you might have changed it when you have run the setup CD so please try other passwords.
2. Adjust the MTU setting.
a. Click on the WAN Setup under Advanced tab.
b. Lower down the MTU size to 1492, 1400, 1358 or 1300.
c. Click on the Apply button.
Note: You may verify from your ISP the recommended MTU size you can use.
