You can delete existing RFC connections.
When you delete it, not only the RFC connection itself is removed, but also the associated RFC destination and configuration data in the file TREXDaemon.ini. The associated RFC servers are stopped.
Go to the RFC: Current tab page in the Landscape: Connectivity window in the TREX admin tool (standalone).
To delete an RFC connection, choose a connection and click Remove: Connection. Confirm the query with Yes. To cancel processing, choose No.