Windows 10: [PC] Teredo unable to qualify. I tried the most if not all solutions.

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Teredo is unable to qualify

Hi,



Thank you for writing to Microsoft Community Forums.



I understand that you are facing issues while playing games as Teredo is unable to qualify. For further clarity on the issue, please respond to the questions below.

1. Are you aware of any changes made to the PC prior to which you weren’t facing this issue?
   
2. Which build version of Windows 10 are you using currently?
   

Refer the article
Which version of Windows operating system am I running?



Meanwhile, I would suggest you to refer the article
Teredo is unable to qualify and see if that helps.



Note: Serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can
restore the registry if a problem occurs. To backup and restore registry key, refer to

this link.



In addition, as you have mentioned that Norton is blocking a port which is being used by Teredo adapter, I would suggest you to try disabling the antivirus and check if the status changes.



Note: If you disable the security software or firewall, the system might be temporarily exposed to security threats and risks. Please make sure to turn it on after performing the steps.



You can also create an exception in Norton for the ports, refer the article

Use the Add Rule wizard



Regards,

Prakhar Khare

Microsoft Community – Moderator

 

My NAT type says "Teredo is unable to qualify"

Hi Kole,

You may receive the error message Teredo is unable to qualify
if your PC is unable to obtain a Teredo IP address. Teredo is a networking protocol that’s used to establish secure communications between clients and servers and to facilitate connectivity between devices behind routers that use network
address translation (NAT). To resolve your concern, we suggest that you follow the steps provided on this

link.

If you have already done those steps as you mentioned in your description, you may proceed to open the network ports and setting a static Teredo port by following the steps on this

link.

Keep us updated with the results after performing the suggested solutions above.

 

Teredo unable to qualify

Hi JayKay,

Thank you for writing to Microsoft Community Forums.

Failure to obtain a Teredo IP address can occur when there’s an issue with your Teredo adapter, when a device on your network is blocking the Teredo protocol, or if there’s software installed on your PC that’s disabling
Teredo functionality. If you haven’t tried the methods listed in the following articles yet, I would suggest you to try them first and see if it works:

• Teredo is unable to qualify
  
• Xbox app server connectivity on Windows 10 is blocked
  
  

Note:

Serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry
if a problem occurs. To backup and restore registry key, refer to this
link.

If the issue persists, I would suggest you to
uninstall and re-install the Xbox app to see if you can get it to work.

• Right click the Windows icon on the taskbar and choose Windows PowerShell (Admin).
• Copy and paste the following command and hit Enter:
  
  Get-AppxPackage Microsoft.XboxApp | Remove-AppxPackage
• Reboot the computer once the command is executed.
• Once the machine restarts, launch Microsoft Store and reinstall the Xbox app.

After reinstalling the Xbox app, open Windows PowerShell (Admin)
again and copy paste the following command to enable Teredo.

netsh interface Teredo set state type=default

Let us know how it goes.

Regards,