Oracle Install Directory : C:\app\oracle\product\12.2.0\dbhome_1 listener.ora edit C:\app\oracle\product\12.2.0\dbhome_1\network\admin\listener.ora Before SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (SID_NAME = CLRExtProc) (ORACLE_HOME = C:\app\oracle\product\12.2.0\dbhome_1) (PROGRAM = extproc) (ENVS = "EXTPROC_DLLS=ONLY:C:\app\oracle\product\12.2.0\dbhome_1\bin\oraclr12.dll") ) ) LISTENER = (D..