ORA Database Error Messages ORA-00126: connection refused; invalid duplicity May 19, 2015 mpbod ORA-00126: connection refused; invalid duplicity Cause: The DUPLICITY in the CONNECT_DATA of the TNS address DESCRIPTION is not correct or is not supported. Action: Correct the DUPLICITY specified in the TNS address. Back to previous menu https://support.oracle.com/ http://www.oracle.com/ Share this:Click to email a link to a friend (Opens in new window)Click to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)