This is a split board - You can return to the Split List for other boards.
I was getting that earlier today. I restarted my router and tinkered around with the router's settings, which seems to have solved it.
mainly...turned off SPI firewallswitched from WEP to WPA2-PSK securitydisabled WPS again after restartMAC filter to allow the 3DSblock anonymous internet requestsno port forwarding or DMZ stuff. I'm the only one in the household that really uses a computer, so I didn't change any of the dhcp or static ip, etc.