Hi Tom, we’re not having any broker issues on our end. When you attempt to connect, do you see any activity in your application’s communication log?
Not that I think this is the issue you’re having, but you can also test your connection credentials using our device simulator. Use the same key and secret that is on your device to connect. Behind the scenes the simulator is connecting to the broker as if it were a device just like you’re doing on the ESP8266.