Try checking http://forum.gbadev.org/viewtopic.php?t=10320 and http://www.ds-xtra.com/Common_Homebrew_Wifi_Problems and see if they help.
Basically you want to change your WFC config to use all manual settings, as homebrew has a hard time with DHCP, the process of automatically obtaining an IP address and DNS servers.
Also note that if you have a Nintendo Wifi dongle, you must use modified drivers to turn it into a SoftAP before homebrew will work with it.
At least SSID Broadcasting is on, so that eliminates one possibility.
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