TNS Database Error Messages TNS-12644: Authentication service initialization failed December 17, 2020 mpbod TNS-12644: Authentication service initialization failed Cause: The routine called to initialize the authentication adapter failed. Action: Enable tracing to determine the exact error. A likely cause is that memory is exhausted. 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)