MQTT crashes app when changed

I added a my own MQTT server address. As soon as I enable with the new server, the node reboots and crashes the IOS app. Open app again and as soon as it connects, app crashes. It appears to work when I connect over WiFi and not BLE. In order to get it back off the MQTT, I do CLI and enable Bluetooth or i flash it again.

I’m not a networking guys, i had a networking guy set it up. About all I know is the MQTT server is on a AWS VPS EC2 instance and I connect to it via my

I don’t know if this is a server/broker issue or something else.