YAAC can communicate with the APRS-IS network on the Internet. To create an APRS-IS connection that is authenticated by SSL certificate (currently an experimental feature only supported by a few APRS-IS Tier 2 servers) rather than by the insecure passcode scheme, first import your ARRL Logbook of the World private key and public certificate, then click the Add button on the Ports tab of the Configure dialog, then change the Port Type to SSL-APRS-IS. The dialog will then appear like this:
The options to be set for an SSL-authenticated APRS-IS connection are:
The hyperlink below the filter expression text field will launch your default web browser pointing at the official documentation for APRS-IS server filter expressions. The hyperlink below that will bring up the status page for the APRS-IS server you are currently using.
The "Test Port" button provides a means of verifying that you have connected to the correct place; it opens a terminal window connected to the configured APRS-IS server so that you can manually test the server for the desired operation. To complete testing, close the terminal window.
If both an APRS-IS port and an RF port are opened, YAAC expects to be used as an I-gate (Internet gateway) station. This tutorial explains more about I-gating.