TNS Database Error Messages TNS-12654: Authentication conversion failed December 17, 2020 mpbod TNS-12654: Authentication conversion failed Cause: The authentication service was unable to convert the credentials of a user from the format specific to the format into the Oracle format. Action: Enable tracing to determine the exact error. 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)