In case user specifies custom KIE_SERVER_HOST variable, for example by using EXECUTION_SERVER_HOSTNAME_HTTP and no KIE_SERVER_PORT is specified then default value 8080 is used. In this case the URL set as Kie server location in system property "org.kie.server.location" is not valid as it references <custom-hostname>:8080 but the Kie server is available just in <custom-hostname>:80. Right now no template allows setting of KIE_SERVER_PORT property.

There can be two possible solutions, either set default KIE_SERVER_PORT to 80 in case KIE_SERVER_HOST is specified by environment property or allow to set KIE_SERVER_PORT in templates.