Windows 2000 (formerly known as Windows NT 5) from Microsoft implements Kerberos 5. Their implementation, however, has some quirks, peculiarities, and bugs. This chapter is a short summary of the things that we have found out while trying to test Heimdal against Windows 2000. Another big problem with the Kerberos implementation in Windows 2000 is that the available documentation is more focused on getting things to work rather than how they work, and not that useful in figuring out how things really work.
This information should apply to Heimdal 1.3.0rc1 and Windows 2000 Professional. It's of course subject to change all the time and mostly consists of our not so inspired guesses. Hopefully it's still somewhat useful.