Same Wifi network name caused TIMEOUT issue on OS X Lion

Today I went to my uncle’s place, and there was a SMC wireless router named “SMC”, and occasionally the Wifi name exactly same at my home.

My iPhone(4S w/ iOS 5.0.1) work out the issue very quickly(w/ the forget this network command), but my MBA cannot get back to old “SMC” network anymore(it’s will popup timeout anyway, and it’s seems you have no place to fix it), finally I found the following step to reset the Wifi setup.

Wifi-fix-1

Wifi-fix-2

Wifi-fix-3

Wifi-fix-5

# CAUTION!!! once you clicked the final continue button on the above last screen, the issue should be fixed, DO NOT continue anymore.