Sony PCG-SRX99 - Manual (Page 175)

I cannot access the Internet.
 Make sure the Wireless LAN switch on the computer is in the ON position or the Wireless LAN PC Card is properly
inserted.
 Check the access point settings. Refer to the instructions supplied with the access point.
 Check if your computer and the access point are connected to one another.
 Move your computer away from obstructions or closer to any access point you may be using.
Page 175