Dear PIlots,
Users of XACARS please not the following, once you have downloaded the .ini file from the site and installed this in to the xacars program you will need to go to the xacars preferences and change all the url's from https:// to http:// ie remove the "s".
XACARS is an older program and will not communicate over the secure channel https://, save your changes and the program will work as desired.
Make sure it's as shown below....
Thanks,
Mark.