The Nintendo 3DS system was unable to connect to the internet.
Did this connection used to work but has suddenly stopped? "Power cycle" your router and modem. To do this, unplug both the modem and the router from the power outlet. Wait a few minutes, and plug the modem back in. Wait a couple of minutes for the modem to initialize, then plug in the router. Try to connect the Wii, Nintendo DS, or Nintendo 3DS online and test for proper response.
Still stuck? We can help! We have an easy-to-follow guide that will walk you through the process of creating a new connection file and starting from scratch. Even if you're sure you've entered the correct security key, we suggest following our guide to create a new connection file and start over. If at the end you still need help, you'll find contact information to reach our specially-trained representatives.