FULL FIX: Teredo is unable to qualify error on Windows 10
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 fix the Teredo error on Xbox One
Teredo is unable to qualify message will prevent you from using Xbox app on your Windows 10 PC. This can be a big problem for some users, and speaking of issues, here are some similar problems reported by users:
- Teredo failed to open tunnel adapter – This is a common problem with Teredo, and in order to fix it, you need to reinstall Teredo adapter.
- Xbox app server 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 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.
Solution 1 – Reinstall Teredo
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 Teredo service and remove the Teredo driver. This is quite simple to do, and you can do it by following these steps:
- Press Windows Key + X to open Win + X menu. Select Command Prompt (Admin) or Powershell (Admin).
- Now run netsh interface Teredo set state disable command.
After disabling Teredo service, you need to remove its driver by doing the following:
- Open Win + X menu and choose Device Manager from the list.
- When Device Manager opens, go to View and select Show hidden devices from the menu.
- Locate Teredo in the Network Adapters section, right-click it and choose Uninstall device. Repeat this for all Teredo devices.
- Uninstall anything you see with “Teredo” in it from the right-click menu
- Restart your PC and re-enable Teredo with this line in Command Prompt (Admin): netsh interface Teredo set state type=default
- Make sure to NOT manually install the Teredo Tunneling Pseudo-Interface adapter as it might cause trouble since it reinstalls automatically
Solution 2 – Check to see if Teredo is disabled from the Registry
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 doing the following:
- Open Command Prompt (Admin) and run this line to check iphlpsvc: reg query HKLMSystemCurrentControlSetServicesiphlpsvcTeredo
- If Teredo is disabled, this line will show up in output: DisabledComponents REG_DWORD 0x8e
- Re-enable Teredo through this Command Prompt line: reg add HKLMSystemCurrentControlSetServicesTcpip6Parameters /v DisabledComponents /t REG_DWORD /d 0x0
After doing that, check if the problem is resolved.
Solution 3 – Make sure IP Helper is running
In order to use Teredo, you need to have 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 doing the following:
- Press Windows Key + R and enter services.msc. Now press Enter or click OK.
- When Services window opens, locate IP Helper service and double-click it to open its properties.
- Set Startup type to Automatic and then click Start button to start the service. Click Apply and OK to save changes.
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:
- Open Services window and double-click IP Helper to open its properties.
- When Properties window opens, navigate to Dependencies tab. Now look in the This service depends on the following system components section. Expand the list and write down all the services. In most cases the problem is WinHTTP Web Proxy Auto-Discovery Service, so be sure to check this service first.
- Now go back to the Services window and make sure that these services are running. If not, enable them.
- After doing that, try to start IP Helper service again.
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 and running netsh interface teredo set state type=enterpriseclient command fixed the issue for them, so you might want to try that as well.
Solution 4 – Check for an invalid value on the Teredo server name
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 by following these steps:
- Default correct parameter in Windows 10: win10.ipv6.microsoft.com.
- Check for the correct parameter with the Command Prompt line netsh interface Teredo show state
- If the parameters aren’t correct use this command line to revert them: netsh interface Teredo set state servername=default
After making these changes, check if the problem with Teredo is resolved.
Solution 5 – Make sure the hosts file entry isn’t causing problems
According to users, sometimes this problem can appear if the hosts file is changed. You can check your hosts file by doing the following:
- You can check this with the command line netsh interface Teredo show state
- If it displays the message failed to resolve server name, use the command line notepad.exe c:WINDOWSsystem32driversetchosts
- 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.
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.
Solution 6 – Check if Teredo is hindered by any installed VPN service
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, follow these steps:
- Navigate to Show Hidden Devices under Device Manager and access Network Adapters
- Uninstall adapters with names similar to TAP-Windows Adapter V9 and see if uninstalling the VPN adapter cleared the Teredo issues.
Once you remove 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.
CyberGhost VPN (currently 77% off) will protect your privacy, and it won’t interfere with your system in any way, so we strongly suggest you try it out.
Solution 7 – Re-enable IPv6 on all tunnel interfaces
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 this 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 do the following:
- Navigate to this Microsoft’s support page.
- Now locate Re-enable IPv6 on all tunnel interfaces and click Download.
- Once you download the file, run it and check if that solves the issue.
Solution 8 – Create a new user account
Sometimes you might be able to fix the problem simply by creating a new user account. This is rather simple and you can do it by following these steps:
- Press Windows Key + I to open the Settings app.
- When Settings app opens, navigate to Accounts section.
- In the left pane, navigate to Family & other people. In the right pane, click Add someone else on this PC.
- Choose I don’t have this person’s sign-in information.
- Select Add a user without a Microsoft account.
- Enter the desired user name and click Next.
After creating a new account, switch to it and check if that solves your problem.
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.
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.
Editor’s Note: This post was originally published in April 2017 and has been since completely revamped and updated for freshness, accuracy, and comprehensiveness.
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