I've been trying to configure my 3DS to connect to the internet using home wifi.
But until now I get the same error code 003-1102.
I tried turning off all security on my router but it is still the same.
I've used wifi at other place and face no problem at all.
Hope someone can guide me on this.

reset your system

Which one? 3DS or pc?
Have done both and still the same

If the router come with your Unifi package, very likely it is your router's problem. Does this happen to your other Wifi connected device?

I bought this router myself, it's a TP Link MR 3420.
Other devices such as my HP does not have this problem.

This is a headache.

So far what I understand:
1 The 3DS WiFi works in other WiFi hotspot
2 3DS not working in your own WiFi hotspot
3 But your HP works with your own WiFi hotspot.
4 You have tried everything to make it work, such as reset etc.

If you absolutely must connect to Nintendo Network, probably you have to rely on your phone's tethering internet..... nothing wrong with your home hotspot.... probably the setting screen is not set up correctly in your 3DS?

Well, basically this problem is a headache for me too.
My 3DS can see my wifi but can't connect to it even when password is removed.
I'm gonna try tethering through my phone now.
It's kinda frustrating since one of the reason I got my router is to connect my 3DS to internet.

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Added on August 23, 2012, 10:50 amUpdate: tethering on my phone works.
But this sucks because it'll drain my 3DS and phone battery.

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Added on August 23, 2012, 10:57 amUpdate #2: It works!
I just notice that 3DS supports b/g wifi but my router is on n wifi.
So I changed my router settings and it worked.

This post has been edited by apersaje: Aug 23 2012, 10:57 AM