Our company requirement for Oracle security specifies all traffic must be encrypted. Although Windchill now supports JDBC over SSL it is documented that solr must continue to use a non-encrypted connection with Oracle.
"For Windchill 11.1 F000 release, Windchill supports JDBCs communication on dedicated TCPS port 2484 configured on Oracle Database server. Cognos and Solr will not support JDBCs. All JDBC communication will be managed on the existing default TCP port 1521 which comes as default Windchill installation. ..."
I verified with ptc support that this restriction exists and that the feature is "not in supported" recommending a Product Idea be created.
"I have confirmed with the R&D Team. Currently, this feature in not supported. Your case for adding it is strong, so suggestion is to file a Product Idea so that your need (and the related business justification) is formally recorded for Product Management review. Please be as detailed as possible regarding the business need, as that will help raise the profile of this request."