ORA Database Error Messages ORA-12618: TNS:versions are incompatible August 10, 2015 mpbod ORA-12618: TNS:versions are incompatible Cause: The two machines are running incompatible versions of TNS. Action: Check the version numbers, and upgrade the machine with the smaller one. 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)