Possible causes for this error message:
Problem: You may have entered your password incorrectly.
Solution: Confirm that you entered the password correctly. Passwords are case-sensitive. Make sure that the Caps Lock key is off, and then re-enter your password.
Problem: KDC requires you to perform pre-authentication, but you have not configured it.
Solution: Verify your host authentication settings.
Problem: The KDC does not support the preferred encryption types specified in Kerberos Manager.
Solution: Change your list of preferred encryption types to be compatible with those supported by the KDC.
Problem: The KDC to which you are authenticating requires TCP protocol for packets over a certain size (this is seen on some Windows KDCs).
Solution: Try changing the value for to less than 1500.