Posted by Wifall

This brief tutorial will (hopefully) teach you how to connect to the alternate WFC servers using the melonDS emulator.
If you already connected previously to the official WFC or an alternate one, you'll have to do the Extra Step first.

1st step: Make sure MelonDS is on the latest version.
- On Windows make sure both MelonDS and the rom file and save are placed in a UAC free directory (desktop, drive root, etc.) Otherwise, right-click on MelonDS and go to proprieties, then go to the compatibility tab and check on the "execute this program as administrator" box, and click ok.
- On Linux, make sure both MelonDS and the rom file and save are placed in a non-restricted directory.
Both can be downloaded here https://melonds.kuribo64.net/downloads.php
- On Android, you can either use the standalone melonDS app (from GitHub, the Play Store one is outdated and will not work) or melonDS DS Retroach core.
You can download either on the most recent versions from GitHub or download here:
melonDS android standalone: here
melonDS DS Retroarch core: here

2nd step: Now boot up your game, select the WFC Settings option (where it's located, depends on the game), and then select the "Nintendo Wi-Fi Connection settings". On the next screen: you will tap either connection 1,2 or 3. On DSi it can be done on the system's settings, go to DSi's settings > 3rd tab > Internet > Connection Settings and then tap either connection 1,2 or 3.

3rd step: Now click on the "Search for an Access Point" option, then after a short load, melonDS emulated access point (melonAP) will appear, select it and tap OK, after a short while, a connection successful message will appear. On DSi mode, you'll also be required to accept the terms of agreement, this must be done BEFORE you set up the DNS! Go to DSi's settings > 3rd tab > Internet > User Agreement to do that. It'll prompt that it needs to access the internet, press Yes. Once connected, select a language, and on the next screen press Next, then click "I Accept" and then click OK.

On DS: On DSi:

4th step: Now click on the newly created connection, then scroll down to DNS settings, then tap on NO in the "Auto-obtain DNS" setting, after that, click on edit on Primary DNS setting and type a DNS of an alternate WFC server (do the same on the Secondary DNS), after that tap on save settings. On DSi go to Internet > connection settings, click on the newly created connection, then click in "Change Settings", go to the "Auto-Obtain DNS" tab, click in no. Once you've done this, click on detailed setup, input the DNS there, and click OK.
On DS: On DSi:

Here's a list of the most famous ones:

AltWFC: 172.104.88.237

Wimmfi: 95.217.77.151

Kaeru: 178.62.43.212

Extra Step: You may be unable to connect if your bios file has an old WFC setting saved in the firmware, in this case, on DS in a WiFi-enabled game, go to the WFC setting on your game then tap Option, and select "Erase the Nintendo WFC Configuration Setting" and then tap OK, the game will shutdown after that. On DSi, go to settings > 3rd tab > Internet > Options > Delete Nintendo WFC Configuration, it will prompt you to confirm, and select yes on both prompts. Once you've done it, you must follow the 2nd step and forward.
On DS: On DSi:


You might find these errors while attempting to connect, along with them you will also find possible solutions:

86420: Natneg error - This is probably caused because of the router or ISP, patching the ROM with the noSSL patch (as described here) can fix these issues, alternatively you can enable DMZ, or port forward UDP 1024-65535.

61020: Login error - The server is probably in maintenance. You should try another server, but you'll have to execute the extra step first.

52200 and 52201: Connection test failed - Try checking your connection stability, and using another internet connection to see if it fixes the issue.

52100: DNS error - It either means that you misconfigured the DNS or either the ISP or router is blocking DNS requests.

52000: Connection error means that no internet connection was found - It can be caused by misconfiguration of your emulator, PC, or even the router itself. Check which mode you are using, if you are using direct mode, check if npCap, Wincap or libcap package are installed in your system. In Windows, make sure that the emulator is running in admin mode if you are using direct mode.

50199 - Generic internet error means that the connection is interrupted - Try checking your connection stability, and using another internet connection to see if it fixes the issue.

23917: Wimmfi-related code - Your firmware is banned.

20110: Login error, the DNS is probably being blocked by your ISP, If you are getting this. Try this tutorial. In some cases, your ISP may block some of these DNS requests, make sure to test them all and check if they are not down for maintenance.
If this fails, you can either use the noSSL patch (as described here) or use the WIFI direct mode option, which may fix these issues. If you want to try direct mode for any reason you'll have to install Wincap (Windows 7), Npcap (Windows 8 or higher), or the Libpcap package (according to your Linux distro), on Windows you will have to run MelonDS.exe in administrator mode. After that, click on config, then click on Wifi settings. Check the "Direct mode" box on the Wi-Fi settings screen and select your wired adapter.

20105: Login error, try deleting your WFC setting as described in the extra step.

Posted by UTK

Hello people. I'm hoping I can get some help here. I've managed to setup and make the WFC work, both on the Nintendo DSi, and on PC with Emulator. But I cant get to make then both play together. I want to play on the PC, and my kid on the DSi.
I've registered the friend codes, but at the game lobby they wont work. It just keeps waiting on this screen...

I'm doing something wrong? If I use the "worldwide" option, it finds opponents and I can play online, works both on emulator or the DSi. So, why it wont work with friends?

On both systems shows this "friend" icon flashing, but the game wont start

Thanks.

Posted by Saizo7

I recommend asking at the Mario Kart DS Network discord server
as this doesn't really have to do with melonDS