How to Configure Nintendo Wii on Your Home Network
Your Wii saves your settings and connects to your network and to Nintendo’s servers to test your connection. That’s all you need to do. Your Wii will automatically connect to your network each time you turn it on.
If your Wii reports any issues with the test, you’re given some cryptic Wii Support Code. Go to Nintendo.com and search with the phrase Wii connection error codes to find a long list that will let you troubleshoot whatever code Nintendo provides you.