Forum Discussion
UDP port 4021 tmobile VS my alarm server...
It is unlikely the T-Mobile is blocking at the network level so it would be related to the router itself. The Envisalink uses UDP port 4021 for communication so the router is blocking that port, po...
I believe your assumption that the update altered the equation. Maybe it was not intentional but it is not something we can know as we don't know what was changed in the firmware update.
The one option as it is would be to use a VPN. I have been looking into the various VPN options. I don't want the additional cost each month but for the encrypted hole through the T-Mobile CGNAT network it might be worth it. They are not all even close to one another in features so the testing with a 30 day free trial is really the best way to confirm the solution is a good one.
