Make sure your Wii is connected to the Internet.
Select Wii Options.
Select Wii Settings.
Now click the right arrow once to view the Internet option > Click Internet
Select Connection Settings.
Now select the connection profile you are currently using.
Select Change settings
Select Auto-Obtain DNS settings i.e. click the right arrow three times until you see Auto-Obtain DNS settings.
Click No, then Advanced Settings.
Now click on Primary DNS and Secondary DNS fields and type in 184.108.40.206 and 220.127.116.11.
Select confirm > Click on Save and Finally click on OK to start the connection test.
Next perform a Wii system update.
And you are done!