Fritz!Box: MAC Filtering

THIS FIXED THE PROBLEM ON MY ROUTER

Disabling the Teredo filter in the FRITZ!Box

1. Click "Internet" in the FRITZ!Box user interface.
2. Click "Filters" in the "Internet" menu.
3. Click on the "Lists" tab.
4. Disable the option "Teredo filter enabled".
5. Click "Apply" to save the settings.

After a huge muck round with my nat type, I finally fixed it...

1 Disabling Teredo filter in the FRITZ!Box

Click "Internet" in the FRITZ!Box user interface.

Click "Filters" in the "Internet" menu.

Click the "Lists" tab.

Disable the option "Teredo-Filter aktiv".

Click "Apply" to save your settings.

Stupidly easy, but hey going from strict to open is all good

opened the ports like normal too

A Teredo server is listening on network port 3544 (UDP) and the FRITZ!Box is, by default, configured to block port 3544 for security reasons.

So with this in mind you would have to login to your FRITZ!Box web utility interface and disable the option: "Teredo filter enabled".

For this to work, you will have to take more sure "Advanced View" is enabled on the user interface of your FRITZ!Box.

- Click "Filters" in the "Internet" menu.

- Click on the "Lists" tab.

- Disable the option "Teredo filter enabled".

- Click "Apply" to save your settings.

I would also make sure IPv6 is completely disabled for all interfaces on your FRITZ!Box.

At this point, make sure only UPnP (Universal Plug and Play) is enabled, as the feature to forwarding (automatically) network ports used by Xbox Live.

Don't forget to "Apply" your configuration and reboot your gateway afterwards.

Post back and let us know how that goes.

Hello,

the problem was related to my router. My router is from AVM and there is an official guide to this problem:

"If the application can only be used with the Teredo protocol, disable the Teredo filter in the FRITZ! Box:

1. Click "Internet" in the FRITZ! Box user interface.

2. Click "Filters" in the "Internet" menu.

3. Click on the "Lists" tab.

4. Disable the option "Teredo filter enabled". If the option is not

displayed, enable the Advanced View first.

5. Click "Apply" to save the settings."

(Source) This option is enabled by default.

I hope that helps!

Rather than individually forwarding all of those ports, I would recommend configuring your FRITZ!Box to enable UPnP for your PC. This will allow Windows 10 to automatically tell the FRITZ!Box exactly which ports it needs to have open, when it needs them,
and then to close the ports back down again when they're not needed any more.

In your FRITZ!Box go to: Home Network > Network, find your PC on the list and click its "Edit" icon, then enable the "Permit independent port sharing for this device" setting.

Hopefully this will improve things for you. I can confirm that on my own network with this setting enabled (and the Teredo filter enabled, the FRITZ!Box default), my Xbox reliably shows NAT as "Open" so it should do the trick for Windows as well.