How To Backtrack The Connection Details From The Extraction Jobs

How to get the connection details used by the extraction. We have the below scenario.
There are numerous connections being established with different sources, and some are duplicated connections were created depending on the need of different credentials with different of permissions of a particular source. Now the permissions have been sorted by the DBA, need to clear out Data Connections which are no longer in use. Stating the IBC is being treated a PROD and any fail schedule will be treated as a downtime needed to identify the connections which are in used by the current extraction process.