I've tried to research this issue up using google & nintendo's error code help as well. I've tried to reset the routers & everything else in the house connects just fine to the router. As well the 3DS was connection just fine two days ago but today just keeps giving me error code 003-2001 for our main router & 003-2102 for our second router. Don't know what else to do & I'm at my wits end.
The error code page for this on this page (click here) suggests the following:
"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."
Make sure you unplug the modem as well.
Already did all of that. None of that even seemed to fix the issue not even for a second. If it gives a little more insight on my issue it actually connects to the router but won't connect to the internet.
Please provide some more specific details about your home network set-up.
What type of Internet connection do you have? DSL, Cable, Satellite, etc
What brand/model router(s) do you have?
What type of wireless security do you use? WPA, WEP, WPA2, WPA-Enterprise, etc
Is there anything "non-standard" about your set-up? Parental controls, manual address assignment, etc.
Also, please comment on the "multiple router" set-up. How exactly is that configured?