How to diagnose malfunctioning wifi?
Tap the Menu button on your handset.
Tap Settings.
Tap Wireless and Networks.
Tap Wi-Fi settings.
Tap the Menu button again.
Tap Advanced ( Figure B ).
Tap the Proxy setting and make sure your
Android device is not set up for a Proxy.
(Unless the Wi-Fi network you are on
requires a Proxy, this setting will get in the
way of your device's access to the computer)
If you tap on Proxy and see an IP address or
domain, delete it.