In the "ac-dir.xml" file put the new password (and new user) ... <Credentials user="CN= ... >{AES}: ... ==</Credentials> ...
Amend the line in the "ac-dir.xml" file so that it is exactly like this: ... <Container objectclass="top,organizationalUnit" attribute="ou" value=""/> ...
Save the modified "ac-dir.xml" file and return to your
CA Identity Minder Management Console Home : Directories : ac-dir
Scroll down the page and click the "Update..." button
Select and load the "ac-dir.xml" file
You should now be able to logon to ENTM with the new user / password.