When attempting to reach the documentation for the REST API (http://hostname:8088/ae/api/v1/openapi2/index.html) within a web browser, the following is displayed:
"code" : 45109,
"error" : "The requested resource cannot be found.",
"details" : "No detail information available."
This is in a working system with confirmed Java Communication Processes (JCP) up and active.
Release : 12.3
Component : AUTOMATION ENGINE
Add the following to your ucsrv.ini under the [REST] section: