Return value $? = 0 with Connection Refused

[benjiprod]

Hi,
I know when exactly my IP address change but sometimes gandyn can't connect to my DNS area.
$ tail gandyn.log
An error occured retrieving public IP address : URLError(ConnectionRefusedError(111, 'Connection refused'),)

I want to make a script to run again gandyn when it display ConnectionRefused but the return value is OK
$ echo $?
0

Why did I get '0' as no error when gandyn.log displays 'ConnectionRefusedError' ?