Feb 20, 2014 ยท check if port 1521 on DGOracleTest2.localdomain server is allowed or blocked using firewall. Also, enable the trace as below: TRACE_FILE_LISTENER = <filename>.trc (The destination file for the trace file) TRACE_DIRECTORY_LISTENER = /export/home (The destination directory for the trace file) LOGGING_LISTENER = on.. "/>