Netflix no longer streaming

I gave the questions some thought and have a couple for you both to consider if you have not done so already.

Do you use the gateway with a third party router on your network or just the T-Mobile gateway? 

Do you have dual stack enabled on the streaming devices you are attempting to use?

The reason I ask is that Netflix is among the largest domains using IPv6 for streaming content delivery and IPv6 does provide some benefits over IPv4 for content delivery. Using dual stack IPv4/IPv6 on the devices would probably be best. With IPv6 on the clients it would also circumvent the 464XLAT overhead due to not requiring the CLAT / PLAT translation between IPv4 & IPv6. I suggest to check the clients and make sure they do run dual stack. If there are any software/firmware updates available for the TV or Firestick also apply updates.

I use Netflix on multiple types of clients here including a Firestick and have not experienced issues but I also do not use an additional router on my network. I have kept it simple and direct. If you do run an additional router with your clients on a network other than the T-Mobile gateway segment it would be worth running the same client(s) on the T-Mobile gateway network to confirm operation as such. 

Just a couple of thoughts as the problem might still be upstream and not a local network issue. If you have not investigated the DNS servers your clients are directed to then I would also suggest to experiment with the target DNS servers for the clients. When I have experienced some internet related communication issues here my alteration of the DNS source away from the gateway did help so I tend to still avoid allowing the 192.168.12.1 gateway to be used for DNS resolution.

Good luck with your endeavor.

I am having the same problem starting on Feb 9th. I cannot stream Netflix on any of my Roku TVs, Samsung Smart TV. Every other streaming service works fine. I have spent several hours with Netflix and T-Mobile, with no resolution. Even one call for over 90 minutes with both Netflix and T-Mobile on the same call. Netflix is taking the position that this is not their problem and would not even let me talk with their technical support team. 

I saw the response from iTinkeralot, but I am not sure what to do based on his response.

It seems my only solution would be to cancel T-Mobile Internet, Netflix, or both. Netflix reps are condescending, claiming it is not their problem and I cannot talk with their technical supporting team.

I use a Google wifi router.

Are you saying that we don't need a router if we use the Gateway?  

Appreciate your time!!

I have an ASUS RT-AC86U router. All my devices connect to this router, either through WIFI or Ethernet. Then I just plug the router into the T-Mobile gateway. I use this configuration because it is easy if I switch provider. Just plug the router into the provider's gateway.

I switched from Spectrum to T-Mobile internet in early December, and everything was working fine until 2/9. The Netflix stopped working on all my TV. What could have happened?

So, the logic behind connecting the clients with the delivery issue direct to the gateway is very simple. IF the delivery is via IPV6, which it is quite possible that is the case then you would have to make sure that traffic is forwarded across YOUR router or mesh gateway interface via IPv6 or it simply will not pass. If you connect the TV or Firestick or whatever it is to either an interface on the network direct from the T-Mobile gateway you remove the additional variable which is your router. When you use the additional router solution you establish a double NAT scenario and may not be routing IPv6. 

If you have left the wireless on the T-Mobile gateway enabled join the TV or Firestick etc… to the wireless network established by the cellular gateway. It does handle IPv4 and IPv6 traffic. I can clearly see this with my Nokia gateway and the statistics reflect multicast traffic TX/RX. I run clients dual stack with IPv4 and IPv6 with no issue. If you want to know your external IPv4/IPv6 address go to whatismyipaddress.com and check it out. If you have a client on your local network and want to know if it can communicate out across your router issue an IPv6 ping to the external IPv6 address from the client or issue an IPv6 ping to one of the major DNS hosts on the internet. If your client cannot communicate out via IPv6 from your local router network do the same test via connected to the network established via the T-Mobile gateway. 

You have nothing to lose by testing the TV or whatever client on the T-Mobile gateway network. It might just work and reveal there is a communication problem across your router.

iTinkerlot, I appreciate you help. 

So I did two things. I connected one TV directly to the T-Mobile gateway via wifi. I confirmed that is was connected to the T-Mobile gateway. It has an IP address of 192.168.12.x. Unfortunately the issue is still there and I cannot connect to Netflix.

I also  use whatismyipaddress.com to check my ip address, and I get this:

My IP Address is:

IPv4: ? 172.59.xxx.xxx (I replaced the actual ipv4 address with xxx.xxx)

IPv6: ? Not detected

Your private information is exposed!

My IP Information:

ISP: T-Mobile USA Inc.

Ciudad: Bellevue

Region: Washington

Country: United States

Does this mean I don’t have an ipv6 address?

If the site does not report both the IPv4 and IPv6 addressing it would sugieren there is no IPv6 address but I have seen the site report one or the other or both at times. Usually it does report both IPv4 and IPv6 addressing. Keep in mind the external IPv4 address you see on that site reflects the external address on the other side of the T-Mobile IPv6 network. T-Mobile runs their network on IPv6 and uses what is referred to as carrier grade NAT (CGNAT) or what is also 464XLAT. It is a translation from IPv4 to IPv6 and then IPv6 back to IPv4. The IPv4 addresses can change/rotate. If you use the site and repeat the test for your external address 5-6 times over a minute or two you puede see the IPv4 address changes due to the routing of the traffic and how it is handled. Today my external IPv4 address is not changing is it does when traffic levels are higher. I have seen it change between 5-6 addresses over a period of time.  Previously the traffic was being routed out of Atlanta and now I am seeing the routing seems to be out of Nashville instead. It seems to be the ever evolving T-Mobile internet solution.

You need to look at the configuration of the networking for the client. See if it has both IPv4 and IPv6 and have both set to obtain their addressing automatic via DHCP. It could be IPv6 is not enabled or the client does not support IPv6 but most clients support dual stack these days so it might just be disabled.

If you have not pointed your client to another DNS server like Google or Cloudflare you might try that vs allowing the gateway to delivery the DNS. 

NOTA: The message, "Your private information is exposed!" reflects that you are not using a VPN to hide your actual IP addressing information. Lots of companies would like to have you subscribe to their VPN service. :-) For more sensitive information it is a good practice but gets expensive.

Problem is, I dont see a way to change DNS on Samsung Smart TV or on a Roku TV or Roku box.

On the Samsung Smart TV:

https://www.techsolutions.support.com/how-to/how-to-change-dns-settings-on-a-samsung-smart-tv-10823

Thanks iTinkeralot. What do you suggest setting the DNS to?