When configuring a new connection for the Connector for REST Web Services, you might not be able to save or test the connection. You will not receive an error message, and the TEST and OK button may be inactive.

TIBCO Cloud Integration - Connect ( Scribe )

This will usually be due to an error or incompatibility in the Swagger specification that was input into the connection properties. It could be that the Swagger spec is from a version that is not supported by the connector. This Connector supports version 2.0 of the OpenAPI Specification. Using a 3.0 OpenAPI Specification will not work. See the OAS 2.0 Specification for more information. Check the link to the connector's help guide below for the latest requirements. 

There might also be a problem with the way the Swagger specification was input. Review the Swagger spec and check for problems such as JSAON formatting issues, or double authentication. Check the knowledge article below for rest authorization information. Validate the specification for errors and  review version information outside of Integration - Connect using a tool such as https://editor.swagger.io/. 

Invalid Rest Web Service Specification causes the connector to be unable to save the connection.

TIBCO Connectors Help Guide

Rest Authorization Knowledge Article