It is a very old wii

SOURCE: conection to the internet through land line

Land line? oh i see... wired connection. It looks like there is a problem connecting with the LAN adaptor.
The Error code has to do with some problem connecting via wired connection.

Try pluging it off and on again while the system is off

Try connecting it with a different LAN cable

Try fine tune some settings on the Wii system options

Try connecting with an other LAN adaptor.

Make sure that the LAN adaptor you are using is made from Nintendo.
If still not working just call the local Nintendo Customer Service and report the problem.

Jaketech

• 67 Answers
• Posted on Jul 21, 2010

SOURCE: Wii Console: when I connect the usb cable to wii, the wii said ...

According to Nintendo's site, the error 51421 refers to connectivity issues with your wired router or modem. They have several suggestions you can try to fix this:
http://www.nintendo.com/consumer/wfc/en_na/ds/results.jsp?error_code=51421&system=Wii&locale=en_US&action2.x=22&action2.y=14

SOURCE: how do i get connection 24 on my wii?

Error Code: 51420 The Wii console is not able to connect to your wired router or modem.

1. If your connection worked previously, check to see if there is a Wii System Update that you have not aquired. To get the latest Wii System Update:
   1. From the Wii's main menu, select the Wii icon along the bottom left of the screen.
   2. Select "Wii Settings".
   3. Click the left arrow to get to Wii System Settings 3
   4. Choose "Wii System Update"
   5. Choose "Yes" to connect to the internet and perform a Wii system update.


2. Make sure that you are using the Wii LAN Adapter made by Nintendo (click here for a picture and connection steps). LAN adapters not made by Nintendo likely will not work with the Wii console.



3. Check to make sure you are not running the Wii LAN Adapter from a USB hub (a device that connects multiple USB products through a single device), as this will likely not work. Connect the USB Connector directly to the modem or router.



4. Ensure that the Wii LAN Adapter setup is correct, and that the Wii LAN Adapter was connected with the console turned off. For step by step connection instructions, please click here.



5. Check to see if the ethernet cable you are using is not working properly, by connecting another ethernet cable from your router/modem to the Wii LAN Adapter. If the connection works using a different cable, then the problem was with the first cable.

1. If your connection worked previously, check to see if there is a Wii System Update that you have not aquired. To get the latest Wii System Update:
   1. From the Wii's main menu, select the Wii icon along the bottom left of the screen.
   2. Select "Wii Settings".
   3. Click the left arrow to get to Wii System Settings 3
   4. Choose "Wii System Update"
   5. Choose "Yes" to connect to the internet and perform a Wii system update.


2. Make sure that you are using the Wii LAN Adapter made by Nintendo (click here for a picture and connection steps). LAN adapters not made by Nintendo likely will not work with the Wii console.



3. Check to make sure you are not running the Wii LAN Adapter from a USB hub (a device that connects multiple USB products through a single device), as this will likely not work. Connect the USB Connector directly to the modem or router.



4. Ensure that the Wii LAN Adapter setup is correct, and that the Wii LAN Adapter was connected with the console turned off. For step by step connection instructions, please click here.



5. Check to see if the ethernet cable you are using is not working properly, by connecting another ethernet cable from your router/modem to the Wii LAN Adapter. If the connection works using a different cable, then the problem was with the first cable.

SOURCE: system will not connect to internet error code

Rofel Lantican

• 2632 Answers
• Posted on Jul 03, 2011

SOURCE: Error Code 51421

Hi,
Welcome to Fixya. If you want to fix the error 51421 just follow the instructions on the link below
How to Fix 51421
Thanks for using Fixya