setting up vMA with AD

Hi,

I am trying to set up vMA and i am up to page 15 of the guide (http://www.vmware.com/support/developer/vima/vma41/doc/vma_41_guide.pdf).

Where it says to go to a windows PC and run this command

ktpass /out foo.keytab /princ foo@VMA-DC.ENG.VMWARE.COM /pass ca... /ptype KRB5_NT_PRINCIPAL -mapuser <vma-dc>\<foo>

replacing <vma-dc> with my domain and foo with the user with permission for the vCenter admin.  My version, if i'm getting it correct, looks like this:

ktpass /out foo.keytab /princ foo@VMA-DC.ENG.VMWARE.COM /pass ca... /ptype KRB5_NT_PRINCIPAL -mapuser ampco.com.au\administrator

which returns

DsCrackNames returned 0x2 in the name entry for ampco.com.au\administrator.

and no file

any hints as to what i am doing wrong?

Thanks

Ian