Verifying Tokens

[Brian]

I do have the following envoirnment

1) MS KDC
2) MIT kerberos on Mac OS X Jaguar
3) Client running on the Mac uses GSS API to get a service ticket from 
the windows 2000 KDC - this works fine
4) Server running on the Mac tries to verify the the token from the 
client using the keytab  I  got from windows ( ktpass)

I get the following Error
Decrypt integrity check failed


I have tried setting the enctypes to des-cbc-crc etc but nothing helps 
, Is there another way to do this