Full Fix: Teredo is unable to qualify error

Radu Tyrsina
by Radu Tyrsina
CEO & Founder
Radu Tyrsina has been a Windows fan ever since he got his first PC, a Pentium III (a monster at that time). For most of the kids of his age, the Internet was an... Read more
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  • Fix Teredo cannot qualify error message: use third-party VPN software, verify Teredo status, or launch IP Helper.
  • How to fix the Teredo issue:  reinstall it, search for invalid values on the Teredo server, or check host file entry.
  • Other solutions useful in how to enable Teredo are to activate again IPV6 or to create a new user account.
  • Make the Teredo not working problem disappear with our solutions, and enjoy some nice gaming sessions on your PC.

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A problem with the Xbox One as well as the Xbox One app for Windows 10 is making people pretty upset.

The problem lies with Teredo, a network adapter protocol that helps facilitate connections such as the ones used when a NAT configuration is present.

If this protocol is disabled or hindered either manually or by software, it can have these detrimental effects on the system.

The first thing you’ll want to do is make sure that your Internet Connection is working properly. Once you make sure that is the case and the problem still persists, you can proceed with the other solutions.

How to enable Teredo on PC?

  1. Press Windows key + X and select Windows PowerShell (Admin).
  2. Now enter netsh interface teredo set state default 
  3. Close PowerShell.

In case the adapter isn’t available, be sure to check our Teredo Tunneling Pseudo-Interface is missing guide.

What are the most common Teredo errors?

Teredo cannot qualify message comes into several versions, and these are the most notable ones:

  • Teredo failed to open tunnel adapter – This is a common problem with Teredo, and in order to fix it, you need to reinstall the Teredo adapter.
  • Teredo is unable to qualify connectivity blocked – This is another Teredo related issue, and if you encounter it, check if Teredo is disabled in your registry.
  • Teredo failed to resolve the server name – Sometimes this error can appear due to your services. To fix the issue, check if IP Helper and other services are running. If not, enable them and the issue will be resolved.
  • Teredo error client is in a managed network – Sometimes this message can appear due to issues with the server name. However, you can fix the issue using the Command Prompt.
  • Teredo keeps disconnecting – This is another common issue with Teredo. To fix it, be sure to check your hosts file, and update it if necessary.
  • Teredo not working, not in device manager – If you encounter any of these issues, you might be able to fix the problem simply by resetting IPv6 on all tunnel interfaces.
  • Teredo is unable to qualify pfSense – Somewhat common problem when using this firewall.

The error also affects various games, so it’s not uncommon to see Teredo is unable to qualify on Windows 11 and 10 error in the following titles:

It’s also reported that this issue affects titles from Epic Games.

How can I fix Teredo is unable to qualify error?

1. Check if Teredo is hindered by any installed VPN service

  1. Open Device Manager and choose Show hidden devices.Fix teredo cannot qualify error
  2. Access Network Adapters.
  3. Uninstall adapters with similar names to TAP-Windows Adapter V9.
  4. Verify if uninstalling the VPN adapter cleared the Teredo issues. 

Sometimes VPN services can interfere with Teredo and cause Teredo is unable to qualify message to appear.

To fix the problem, it’s advised to disable and remove VPN adapters from your PC. To do that, use this solution,

Once you remove the VPN from your PC, check if the problem is resolved. If removing the VPN solves the problem, it might be a good time to consider switching to a different VPN software.

Hence, it is advisable to consider effective VPN services to avoid this kind of error on your device. Then choose from the best VPNs for Windows 10 computers.

2. Check to see if Teredo is disabled from the Registry

  1. Open Command Prompt (Admin) and run this line to check iphlpsvc: reg query HKLMSystemCurrentControlSetServicesiphlpsvcTeredo
  2. If Teredo is disabled, this line will show up in output: DisabledComponents REG_DWORD 0x8e
  3. Re-enable Teredo through this Command Prompt line: reg add HKLMSystemCurrentControlSetServicesTcpip6Parameters /v DisabledComponents /t REG_DWORD /d 0x0

Sometimes Teredo is unable to qualify error can appear if Teredo is disabled in your registry.

This can lead to problems, but you can modify your registry with ease by using these lines.

After doing that, check if the problem is resolved.

3. Make sure IP Helper is running

  1. Press Windows Key + R and enter services.msc. Now press Enter or click OK.
    Teredo failed to resolve server name
  2. When Services window opens, locate IP Helper service and double-click it to open its properties.
    fix the teredo cannot qualify error
  3. Set Startup type to Automatic and then click Start button to start the service. Click Apply and OK to save changes.
    Teredo keeps disconnecting

In order to use Teredo, you need to have the IP Helper service running. If this service is disabled for some reason, you’ll encounter Teredo is unable to qualify error.

However, you can fix the issue by using this solution, with the steps shown above.

Once you start IP Helper service, the problem with Teredo should be resolved completely.

Several users reported that IP Helper service won’t start due to issues with dependent services. However, you can solve this problem by doing the following:

  1. Open Services window and double-click IP Helper to open its properties.
  2. When Properties window opens, navigate to the Dependencies tab.
  3. Now look in This service depends on the following system components section.
  4. Expand the list and write down all the services.
  5. In most cases the problem is WinHTTP Web Proxy Auto-Discovery Service, so be sure to check this service first.
    Teredo not working, not in device manager
  6. Now go back to the Services window and make sure that these services are running. If not, enable them.
  7. After doing that, try to start IP Helper service again.

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If the IP Helper is already running on your PC but you still have the problem, simply restart it and check if that fixes the issue.

Several users reported that restarting both IP Helper and WinHTTP Web Proxy services was a good starting step.

After that, running a command was the second step that fixed the issue for them. Try out this simple two-step solution and type in the following: netsh interface teredo set state type=enterpriseclient

4. Reinstall Teredo

  1. Press Windows key + X to open Win + X menu. Select Command Prompt (Admin) or Powershell (Admin).
    Teredo not in device manager
  2. Now run the following command: netsh interface Teredo set state disable

According to users, sometimes in order to fix the Teredo is unable to qualify message you need to reinstall Teredo completely.

This requires you to stop the Teredo service and remove the Teredo driver. This is quite simple to do, and you can do it by following the steps shown above.

After disabling the Teredo service, you need to remove its driver by doing the following:

  1. Open Win + X menu and choose Device Manager from the list.
    Teredo failed to open tunnel adapter
  2. When Device Manager opens, go to View and select Show hidden devices from the menu.
    Xbox app server connectivity blocked
  3. Locate Teredo in the Network Adapters section, right-click it and choose Uninstall device. Repeat this for all Teredo devices.
     Teredo failed to open tunnel adapter
  4. Uninstall anything you see with Teredo in it from the right-click menu
  5. Restart your PC and re-enable Teredo with this line in Command Prompt (Admin): netsh interface Teredo set state type=default
  6. Make sure to NOT manually install the Teredo Tunneling Pseudo-Interface adapter as it might cause trouble since it reinstalls automatically

If you ever wondered how to enable Teredo on PC, the steps above should give you all the information you need. If you have more problems, read our Microsoft Teredo Tunneling Adapter has a driver problem guide for more solutions.

5. Check for an invalid value on the Teredo server name

  1. Default correct parameter in Windows 10: win10.ipv6.microsoft.com.
  2. Check for the correct parameter with the Command Prompt line netsh interface Teredo show state
  3. If the parameters aren’t correct, use this command line to revert them: netsh interface Teredo set state servername=default

If you keep getting Teredo is unable to qualify error, you might be able to fix the problem simply by checking the server name value.

This is quite simple, and you can do it from Command Prompt just with the commands and parameters from this solution.

After making these changes, check if the problem with Teredo is resolved.

6. Make sure the host file entry isn’t causing problems

  1. You can check this with the command line netsh interface Teredo show state
  2. If it displays the message failed to resolve server name, use the command line notepad.exe c:\WINDOWS\system32\drivers\etc\hosts
  3. Use Notepad’s Edit/Find function to search for win10.ipv6.microsoft.com and use the Find Next feature until you find another entry which you will subsequently delete.

According to users, sometimes this problem can appear if the hosts file is changed. You can check your hosts file by following these simple three steps.

Many users reported Access denied message when editing hosts files, and this is just a security warning.

We explained in one of our earlier articles how to circumvent this problem, so be sure to check it out.

7. Re-enable IPv6 on all tunnel interfaces

  1. Navigate to this Microsoft’s support page.
  2. Now locate Re-enable IPv6 on all tunnel interfaces and click Download.
    Xbox app server connectivity blocked
  3. Once you download the file, run it, and check if that solves the issue.

If you’re having problems with Teredo is unable to qualify message, the issue might be related to IPv6. Sometimes IPv6 can become disabled on tunnel interfaces and that can lead to these problems.

To fix the issue, you need to download a file from Microsoft that will re-enable all IPv6 interfaces. This is quite simple, and you just need to follow the previously shown steps.

8. Create a new user account

  1. Press Windows Key + I to open the Settings app.
  2. When the Settings app opens, navigate to the Accounts section.
    Teredo failed to open tunnel adapter
  3. In the left pane, navigate to Family & other people.
  4. In the right pane, click Add someone else on this PC.
    Xbox app server connectivity blocked
  5. Choose I don’t have this person’s sign-in information.
    Teredo failed to resolve server name
  6. Select Add a user without a Microsoft account.
    Teredo error client is in a managed network
  7. Enter the desired user name and click Next.
    Teredo keeps disconnecting

Sometimes you might be able to fix the problem simply by creating a new user account. This is rather simple just like in this solution.

After creating a new account, switch to it and check if that solves your problem.

How can I reset Teredo?

  1. Press Windows key + X and choose Windows PowerShell (Admin).
  2. Now run the following command: netsh interface teredo set state disabled 
  3. Next, you need to run this command: netsh interface teredo set state default 

If the issue is resolved, you might want to consider moving your personal files to the new account and using the new account instead of your old one.

In case you don’t have this component installed, read our guide on how to download the Teredo tunneling adapter for Windows.

Teredo is unable to qualify message can cause issues on your PC, but we hope you managed to solve it using one of our solutions.

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Frequently Asked Questions

  • Teredo is unable to qualify message can cause issues on your PC, but we hope you managed to solve it using one of our solutions.

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