After few hours google-ing, I found an answer.
Go to your router WLAN settings, what you need to do is to setup your router with either:
Authentication type:
# WEP
# WPA PSK
# WPA2 PSK
# WPA PSK/WPA2 PSK MIXED
Encryption Mode:
# AES
# (Somehow TKIP + AES doesn't work)
Apply and save. (I don't restart my router, still works).
Restart your Switch, you should now be able to see and connect to your WiFi.