How to Fix “Teredo Is Unable to Qualify” in Windows 10
So you can get back to the game
Teredo is a networking protocol. It’s used to initiate a secure connection between a client and server, such as with devices that use network address translation (NAT). If Teredo isn’t working it means that the Xbox Live app, for example, is unable to establish connections with other devices and you won’t be able to use party chat or multiplayer gaming on Xbox Live.
There are many things that can cause the “Teredo is Unable to Qualify” error in Windows 10. In this article, we’ll cover several possible fixes for this problem so that you can get back to gaming.
Note that some of these fixes involve making changes to the registry. We recommend making abackup of the registryin case problems occur during this process.
Check Your Internet Connection
An internet connection is necessary for Teredo to work, so check this first of all. To check your internet connection:
If your internet is not connected, you will need totroubleshoot this issueprior to any other fixes.
The “Fix It” Option
There is an automatic troubleshooting option underXbox Networkingthat can solve known errors with Teredo.
Ensure Teredo Is Enabled
Teredo can sometimes be disabled in the registry. To check if this is the case, do the following:
reg query HKLM\System\CurrentControlSet\Services\iphlpsvc\Teredo
netsh interface Teredo set state type=default
reg query HKLM\System\CurrentControlSet\Services\TcpIp6\Parameters
reg add HKLM\System\CurrentControlSet\Services\Tcpip6\Parameters /v DisabledComponents /t REG_DWORD /d 0x0
Check IP Helper Service
The IP Helper service is necessary for Teredo to run and function as designed. To ensure this service is running:
If your IP Helper won’t start due to issues with dependent services, try the following:
Check Teredo Server Name
Teredo needs a valid server name to function correctly. To check and fix this issue:
netsh interface Teredo show state
netsh interface Teredo set state servername=default
If this didn’t fix the issue, Teredo may be being blocked by an application. To check this:
netsh interface Teredo show state
notepad.exe c:\WINDOWS\system32\drivers\etc\hosts
Check the Home Router
Some routers will block Teredo connections if they aren’t configured correctly. Update your router to the latest firmware and determine how to enable Teredo tunneling (check your router support documentation for how to do this as it varies between models).
Check Your VPN
Some virtual proxy networks (VPNs) disable Teredo connectivity. To check if this is the case and fix the problem, you need to remove any VPN adaptors from your PC.
Note:This will most likely affect your VPN software. If the VPN is causing issues with Teredo connectivity, you may need to consider moving toanother provider.
Reinstall Teredo
If none of the above have worked, try reinstalling Teredo from scratch.
netsh interface Teredo set state disable
All Done!
Hopefully, this guide has helped you fix the “Teredo is unable to qualify” error and you can head back to the game.
If any of these fixes helped you, or you have a fix that isn’t listed here, let us know in the comments below!
Jake Harfield is an Australian freelance writer whose passion is finding out how different technologies work. He has written for several online publications, focusing on explaining what he has learned to help others with their tech problems. He’s an avid hiker and birder, and in his spare time you’ll find him in the Aussie bush listening to the birdsong.Read Jake’s Full Bio
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