This error is most likely due to your version of IGAM still sending traffic over TLS 1.0, which was deprecated on March 31st, 2018. In order to restore normal functionality, you must upgrade your installation of GIFTS/GIFTS Alta to the latest versions. The upgrade files for these versions can be found by navigating to Blackbaud.com > Support > Downloads. Included in the download files are instructions for how to perform the upgrade. Once you've upgraded your installation to the latest version, normal IGAM functionality should return.