Xbox Live party chat and MTU problem

[Dubs]

Hi, i have been using Three 5g for a week now and while i am very pleased with my DL speeds, i cannot join people in xbox live party chat. The xbox says i have an mtu problem. I have tried port forwarding, putting my xbox in the dmz and turning off the firewall but nothing works.

[Ben1504]

I had this same issue kept disconnecting from party chat, what worked for me was changing APN from ‘3internet’ to ‘three.co.uk’ all is working fine now.

[Darren5688]

I’ve had this problem for 6 months. Basically you was sold a lie like many other people. You simply can’t use three broadband for gaming. 

[Shhsjd]

Any confirmed fixes? Same problem, party chat not working

[Ben1504]

Change APN setting from ‘3internet’ to ‘three.co.uk’ works fine now for me

[Neverworksright]

So after 2 years of playing a lot of Xbox games online with voice chat I now to have the Mtu issue and after calls to Xbox and zte I painfully clear it’s a 3 issue and to be fair as usual the call centre staff were useless is this ever going to be resolved?

[crabmandoo]

I have the same issue, have you found a result?

[Neverworksright]

It’s to do with the mast as mine now works again nothing changed 

[JonathanB]

Thanks for confirming this @Neverworksright, that seems to line up with the testing and research I've done too.

Unfortunately it does seem to be an issue caused by either signal strength, or congestion in the network. The network's MTU is 1500 in normal conditions.

There's a couple of things that may help, UPNP enabled to help give an open NAT, using an Ethernet rather than Wi-Fi if possible, the router being positioned as optimally as possible, however coverage, network maintenance, and contention between multiple users can still cause this to happen. We're always investing in the infrastructure though, so hopefully there'll be less of this issue as time goes on.

Thanks,
Jonathan

[TheJunglist]

After trying several different things static ip>add to dmz, port forwarding etc with no joy. I've resolved the issue described on my son's xbox series s by enabling UPnP in the router's settings, then by selecting a different port on the xbox the NAT type went from strict to open and issue is resolved - You may have to try a few different ports, luckily it was the first port I tried!  Hope this helps