Fix Wii Error Code 85020, 80510, 81010

The Wii Error Codes 85020, 80510, 81010 messages are typically caused by an unstable network connection. The issue could be with your connection environment, your friend's connection environment, or a temporary issue with the Nintendo Wi-Fi Connection.
The servers may be trying to handle an unusually high amount of traffic (especially if you are trying to play online with a recently-released or popular game, or if there is a new Wii system update). Please retry your connection later
If you have waited a few hours and are still experiencing issues, try the following:

1. How are you connecting online? The Nintendo Wi-Fi Connection is only compatible with Cable, DSL, and Fiber-optic internet connections. If you are connecting via Satellite, EV-DO (cellular), Dial-up, or other types of connections, then you should try to use an alternate type of connection. Contact your Internet Service Provider if you are not sure what type of internet connection you have.
2. The error may be caused by a basic setting on the router that needs to be adjusted (such as the channel).
3. Some games may need certain settings on your router enabled or disabled to allow a successful connection with other players. This can include UDP and firewall settings that will vary from router to router.