Did something change in how certificate renewals work? I've been using 8.1 with an auto renew script that bundles the cert and chain into /usr/local/bin/ignition/webserver/ssl.pfx with an alias of ignition and password of ignition, then invoking gwcmd.sh --reloadks to apply the new certificate.
This doesn't seem to be working anymore after upgrading to 8.3. The docs don't seem to discuss applying a certificate outside the GUI. At a glance I don't see anything in the API for certificate management either. I could be missing something though.