MQTT Ports blocked while using ATT 4G LTE cell network
I am trying to connect to an MQTT broker in the internet via ATT 4G cell network. I am not able to ping the host as well as connect to the MQTT broker using ports 1883, 883, 443, 8443, 80 and 8080.
If I disconnect from cell network and use wifi, then the server is pingable as well as I can establish connectivity with the server.
I also do not have any problems while using a reseller's (MVNO) network that utilizes ATT network (it uses reseller specific gateway). Has anybody else encountered similar issue? How should I about resolving this issue?