I have configured an external account for the Mobile channel. I am using the Extended generic SMPP connector. I have set the SMPP parameters according to the providers specs and have had them whitelist the public IP of the host of our AC instance.
When I execute a delivery I do not get an SMS message and what I see in the logs is the MTA trying to connect repeatedly with no success. (See below) What configuration am I missing to get this connection to be successful?