How to reset Wi-Fi settings?

Question

Somehow Wi-Fi stopped connecting on my phone. It is not a hardware issue, as it does work when I perform a reset.

What files do I need to delete to get Wi-Fi back working? I don’t want to reset my phone.

^{If relevant, model is Sony Arc S, using CM9.}

Answer 1

I removed data/etc/wifi, data/misc/dhcp and data/misc/wifi and it worked.