TNS Database Error Messages TNS-12542: TNS:address already in use December 16, 2020 mpbod TNS-12542: TNS:address already in use Cause: Specified listener address is already being used. Action: Start your listener with a unique 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)