This is from the Nintendo Customer Service Website:
Error Code: 051099
This error code can occur for two different reasons:
There appears to be a compatibility issue with the security settings on your router:
- You are trying to agree to the User Agreement of the Nintendo DSi or Nintendo DSi XL, but are receiving error code 51099. This can occur if the Nintendo DSi or Nintendo DSi XL tries to connect to Nintendo's servers to download the User Agreement, but there is no existing Internet connection setup on the system. To connect your Nintendo DSi or Nintendo DSi XL to the Internet, please click here.
- You are trying to play a Nintendo DS game online with a Nintendo DSi or Nintendo DSi XL, but your home Internet is set to WPA security. Please read the following:
Are you using WPA security?
No, I am using WEP security
If you are using a Nintendo DSi or Nintendo DSi XL, you will be able to connect online and use many online features with WPA security. However, you will not be able to play original Nintendo DS games that are Wi-Fi compatible, as they are only programmed to work with WEP security. In order to play these games online, you will need to do the following (If you are not receiving this error when attempting to connect games online, click here):
- Change your wireless security to WEP or temporarily disable wireless security if you wish to connect to the Nintendo Wi-Fi Connection.
- If you are unable to log into your router or do not know how, you can check our router look-up page (link) to see if it is listed. If your model number is not listed, check any similar models from the same manufacturer for default information. If you are still unable to log into your router, please refer to the router manufacturer or the company that provided it.
- Make sure your router is not on our list of incompatible routers. If it is, we recommended using a router that is compatible or co
nnecting from a hotspot location.
- The wireless security settings are typically found under sections labeled 'Wireless', 'Basic Wireless' or 'Wireless Security'.
- Change the security mode to WEP, and chose your encryption type. The 64-bit encryption type typically uses a 10 character key while the 128-bit encryption type uses a 26 character key. Hexadecimal keys consist of letters A-F and 0-9, whereas ASCII keys have no limitations and are case sensitive. Be sure to use the key that is listed in 'key slot 1' and make sure you are not using a 'passphrase'. For specific information about changing your security type please see your router's manual or contact the manufacturer.
Important Note: it is recommended that any changes made to the router are performed from a computer that is wired via Ethernet cable to the router. In addition, any changes made to wireless security must also be adjusted on other wireless devices in the home that use the router (e.g. laptops, other game systems, etc). For instructions on how to change these devices, refer to the user manuals for these devices or contact the manufacturer.
- Establish a connection in connection files 1-3 on the Nintendo DSi or Nintendo DSi XL. Make sure you are putting the WEP key into the Nintendo DSi exactly as it appears on your router page.
If the error persists while using WEP (or if you are receiving this error with other Wi-Fi features), follow these steps:
If after trying the steps above you are still receiving this error code, please call 1-800-255-3700 for further assistance.
- Keep trying, as there may be a temporary network issue. If the problem persists, or has been consistent over a period of time, move on to the next step.
- Configure the Nintendo DSi or Nintendo DSi XL manually
Please note: if your router is set to broadcast the network but the Nintendo DSi or Nintendo DSi XL is not finding the access point then a manual setup will not resolve the error. There may be another problem, such as interference, or a basic setting in your router that is causing compatibility issues. Be sure that your router is set to 'Enable SSID broadcast' or 'Enable Wireless broadcast'. If you prefer to keep your network name hidden, verify the correct spelling and case of your router's SSID.
- Check your router on our router listings page to see if there are any special notes for your router
- Try changing the channel on your router to 1 or 11. Ensure there are no other wireless devices in the area causing interference. Make sure you are within range of the router.
Important Note: it is recommended that any changes made to the router are performed from a computer that is wired via Ethernet cable to the router. Also, any changes made to wireless security must also be adjusted on other wireless devices in the home that use the router (e.g., laptops, other game systems, etc). For instructions on how to change these devices, refer to the user manuals for these devices or contact the manufacturer.
- Try adjusting the Transmission rate of your router to 1 or 2, and the basic rates of your router to 1-2 mbps.
- Ensure that your wireless mode is set to a b/g mixed mode, and not an 'n only' mode.
- Check to see if you have MAC filtering enabled. If you do, be sure that the Nintendo DSi or Nintendo DSi XL system's MAC address is in the 'allowed' list.
- Try temporarily disabling your router's firewall.
- Try temporarily disabling your router's wireless security.
Important Note: Please be reminded, that any changes made to wireless security must also be adjusted on other wireless devices in the home that use the router (i.e. laptops, other game systems, etc). For instructions on how to change these devices, refer to the user manuals for these devices or contact the manufacturer.
- Check to see if your router has the latest firmware. Verify this by visiting the support sections of the manufacturer's website, as they often have more current versions than what your router may automatically find. Please follow all manufacturer guidelines for the correct method of updating your router's firmware.
- If the problem is still persisting try power cycling your router. Unplug the power cable from the router hardware and keep it powered down for 30 seconds to a minute. Plug the power cord back in and wait for the router to finish re-initializing. Test the connection again.