On the Macintosh login window, log in as an IPA user.
After you have logged in, open a terminal and run the following commands:
$ id (ensure that the userid and groupid are correct)
$ klist (ensure that you have a valid Kerberos ticket)
To open the Terminal application, navigate to Applications/Utilities/Terminal.app or use the keyboard shortcut Command-Shift-U. You can also drag the Terminal icon to the Dock to make it permanently available on your Desktop.