Unable to connect Chamberlain garage door opener via 5g internet

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Working through multi vendor solution to enable MyQ app to successfully connect to Tmobile home internet.  After long trouble shooting with Tmobile and Chamberlain, determined port 8883 is closed and the myq server connection requires an open 8883 port.  Neither vendor is being responsive with a solution.  

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I purchased a new Netgear extender as recommended by T mobile and I assumed it was at factory settings but using the Netgear app, it would not connect to the netgear online set up.   I sent it back to Amazon.   I have a Nighthawk extender but it connects to the Nighthawk router which did not connect to the Gateway .   I was told by T mobile that they were not compatible, so put them back on the shelf. Which extender connected successfully?   Thanks

Mine is old NetGear N300 Model EX2700. I got it at least 5 year ago.

I do not think you need to buy a new extender. Your nighthawk extender should work. Your extender always tries to connect to the “Known” network it has connected to. You need to reset it to factory default setting. At that time, you will be able to pick Gateway network. You need to download a manual to follow the initial setup procedure after resetting to factory default. Trust me, t-mobile support would not know your extender better than you do. Incompatibility is an easy excuse to get you off the phone.

Your netgear should work also. But your extender might only work for 2.4 GHZ network as mine does. So you will need to separate 2.4 GHZ network out from default t-mobile gateway’s hybrated network to create two networks for your t-mobile gateway. One for 2.4 GHZ, one for 5GHZ. At my home, 5GHZ is always much faster than 2.4 GHZ network. I have speed around 300 MBPS. So all my laptop/phone use 5GHZ network. But I leave this 2.4 GHZ for all the devices such as thermostat, smart devices. So far all works fine now.

I’m guessing T-Mobile has no interest in resolving this issue. Love everything else about it but this issue is forcing me to consider an alternative. So disappointed!

Userlevel 2

It has been a while since I last posted on this conversation.  Something really strange is going on either with Tmobile home internet or chamberlain or both parties.  MyQ mysterioulsy started working back in early April with no action on my part.  Then on April 29th, MyQ stopped working.   It has been that way since.  I reviewed by MyQ history and you can see breaks in garage door logging, usually for less than a week.  Like other posters on this thread, I really wish TMobile would address this lack of support.   

What I find even more distressing is not one TMobile support team member has even commented on this issue.  Argh!

There is actually a confirmed solution for this as I had exact same issue everyone else is complaining about.

You can't connect directly to the TMO router. It just won't work. 

I resolved this issue with a WiFi extender but you have to make sure it runs separate 5ghz and 2.4ghz networks. Mine was $50 on Amazon. Model shown at this link. 2022 WiFi Range Extender Signal Booster up to 5000sq.ft and 35 Devices, Internet Booster for Home, Wireless Internet Repeater and Signal Amplifier,4 Antennas 360° Full Coverage . Then when you go through the process to add the chamberlain opener don't connect directly you the TMO router but instead connect to the 2.4ghz network created by the extender. Boom. First attempt to connect worked.