Errors when running ktpass on windows 2003

[Celia Clark]

Hi,

I am trying to generate a keytab file, but am encountering problems when
running the ktpass command:

ktpass -princ host.doman at DOMAIN -pass password -mapuser host -out
c:/host_HTTP.keytab -mapOp set -ptype KRB5_NT_PRINCIPAL -crypto DES-CBC-CRC

Targeting domain controller: DOMAINCONTROLLER.domain
Failed to set property "servicePrincipalName" to "domain" on Dn=...... 0x13
WARNING: Unable to set SPN mapping data.
If host already has an SPN mapping installed for host.domain, this is no
cause of concern
Key created
Output keytab c:/host_HTTP.keytab
Keytab version 0x502
keysize 76 host.domain at DOMAIN ptype 1 (KRB5_NT_PRINCIPAL) vno 3 etype 0x1
(DES-CBC-CRC) keylength 8 (0x3e80d910fed62fe5)

Does anyone have any ideas what the problem might be?

Many thanks,

Celia