SYMPTOM:
While trying to fetch the list of cubes from the Cube Catalog, the following error message is displayed:

Error in accessing information from the external data source (Database Instance: , Error: ExecCubeQuery failed. MDX Catalog read failed. Error type: JCO layer error. JCOCatalog.fetchCubes failed. Java.lang.Exception: Error during fetching Cubes Exception during Bapi Exception: com.sap.mw.jco.JCO$Exception: (104) RFC_ERROR_SYSTEM_FAILURE: An exception occurred that was not caught.