Effective in version 10.5.2, authentication error messages and the location of detailed information about user authentication failures have changed in the following ways:
The User Activity tab in the Administrator tool contains a log of user actions including logins from clients. Effective in version 10.5.2, the log contains enhanced information about failed attempts to log into web applications, including the Administrator tool, the Developer tool, and the Analyst tool.
Previously, information about user authentication failures appeared in error messages.