Forza Horizon 4: Unable to join game sessions. (Teredo can't connect)

Hello. After what you suggested we are still on able to get online. It is not just Forza horizon 4 for it is Forza horizon 3 as well. This is the error

Unable to join session

for support, join forums at...

there is s support ID

a server ID

fsiled to redolve server address. Check your DNS settings snd try again.

I recently bought Forza Horizon 4 and noticed that every time i join the game it says "Unable to join session". So i thought it might be a problem with Teredo, but "netsh int teredo show state" output seems ok, and then i noticed that Xbox App shows 100%
packet loss, when "Xbox Networking" in windows settings shows lower ping and 0% packet loss.

I flushed firewall and network settings, but i still can't connect to Xbox live services. Firewall is enabled, all microsoft telemetry enabled too.

My NAT type is open, i have static IP.

Thing is, i can connect to xbox app via my laptop, so this isn't my internet connection issues.

Also, when i turned off Windows Firewall, i noticed that now i have lowest ping and 0% packet loss, BUT i can't play online because of stupid microsoft teredo adapter. So, what might cause this problem?

If you click "Check again" in the "Xbox Networking" you get Ping -1 ms and Packet Loss 100%?

Hello MateuszByrtek,

Thanks for keeping us updated. We understand that you are experiencing a teredo error when trying to play Forza Horizon 4 online. Is this correct? Is this the only game with this issue?

If you haven't already, check out this troubleshooting article: "Teredo is unable to qualify"

Also, you may want to post on the forza forums linked above if this is the only game with this issue.

Hallo SlappyMagoo , and everyone

Forza Horizon 4 - Teredo service problem on PC.

Read this if you have a Xbox Networking problem on your Windows PC

Message : 'Teredo is unable to qualify' , and 'Service Connectivity' is blocket in Xbox Companion Console.

For everyone who follows the troubleshooting steps on https://support.xbox.com/ , when you c'nt play Multiplayer an Xbox game on PC.

It can helps when you :

Reset your Modem/Router after each step, and see of the problem is gone.

I followed the steps 5 and 6 for solution the Teredo and Service problem, and after that, I reset my Modem/Router.

Now I was able to play Multiplayer in Forza Horizon 4 on my PC.

Hi RedHawkj,

Did you check out the Forza Support page for a solution?

Check out this IPsec error message Support page

Hope this helps 🙂