TNS Database Error Messages TNS-04017: CMCTL: missing Connection Manager data in CMAN.ORA November 5, 2020 mpbod TNS-04017: CMCTL: missing Connection Manager data in CMAN.ORA Cause: CMAN.ORA does not contain Connection Manager data. Action: Define the correct data for the Connection Manager, then restart the CMCTL program. 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)