All you have to do to enable TLS on an Ignition 8.1.x gateway is drop a PKCS#12 keystore into place at ${IGNITION_INSTALL_LOCATION}/data/local/ssl.pfx (note that this location differs slightly from a standard install in order to preserve it in the data volume via a sym-link from ${IGNITION_INSTALL_LOCATION}/webserver/ssl.pfx).
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