Error Code: 86420
If you get error code 86420 only some of the time, chances are this is temporary and the issue will resolve itself. We encourage you to keep trying.
If you are consistently getting error code 86420 and you are unable to make a connection with other players, the troubleshooting below may help resolve the issue. If the following troubleshooting doesn't help you, or you would like more specific assistance, please fill out our online form to provide us the details of your situation.
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When does this error code appear?
Occurs Immediately (Super Smash Bros. Brawl): If the error code occurs immediately after selecting "With Anyone" (not friends) from the Nintendo Wi-Fi Connection, our servers may be experiencing a high amount of traffic. Please try to connect again later.
Occurs when looking for a match (all games): If the error code occurs after the matchmaking process has started, it is likely an indication of NAT negotiation problems. Try the connection again later. However, if the error still occurs regularly after matchmaking has been running, even for more than a minute, please read the following instructions:
Do you receive this error every time the Nintendo Wi-Fi Connection attempts to find a match for you?
If you receive this error every time, please proceed to step #2 on this page.
If you receive this error only when playing a particular friend, then it is likely a problem with the friend's firewall settings on their connection. If possible, ask your friend to try troubleshooting on this page.
In order to solve this problem, you may consider adjusting your router's Port Forwarding settings*. Each router is unique, so consult the owner's manual for your router or contact the manufacturer for specific information on working with your router's ports. For your information:
If you are prompted for a device or profile name, you can enter anything you like (such as Wii, etc.).
The starting port to open is 1, the ending port to open is 65535 (or as high as the router will allow).
Protocols will need to be set to UDP only.
Set the IP address for the ports to forward to the same as the Wii's static IP address. If you don't know what the Wii's IP address is, the best way to determine it is by performing a manual setup:
How to manually configure the Wii's IP address:
The first thing you'll need to do is find out what IP address range you should be using. To do this:
Click the "Start" button in the lower left-hand corner of your computer.
Next, you will need to access the command prompt. To do this:
Windows XP users click "Run."
Windows Vista users click inside the search bar.
Type "cmd" into the box and press Enter.
Type "IPCONFIG/ALL" and press Enter. The IP address, Subnet Mask, Default Gateway, and DNS servers of the PC will be displayed.
if u want all info:
http://www.nintendo.com/consumer/wfc/en_na...mp;action2.y=20
edit: longest post ever made