Honeywell wifi thermostat not able to connect
I have a Honeywell RTH6580WF thermostat which used to work through my Nokia 5G gateway but got disconnected a month or so ago and now cannot re-connect. I've tried creating new 2.4 network, changing wifi passwords, not requiring a wifi password, hidden SSIDs. Nothing. Every other device, computer, phone connects just fine. I can connect to the thermostat's web interface, choose the wifi, enter the password and then the thermostat produces one of these error codes E01, E02, and E42. The thermostat manual and Honeywell support resources aren't helpful. Honeywell support suggests it could be that one of ports 443, 113, or 80 are blocked by the gateway or T-Mobile ISP. I was told by Honeywell that if the thermostat can't communicate with Honeywell servers during initial wifi setup, I would see one of these errors. If anyone has had this issue and found a way to get your thermostat to connect, please share. I've spent way too many hours on this. Even bought 2 new thermostats and they fail too. :(