Need help interpreting krb5kdc log file, specifically etypes definitions

[alextc@microsoft.com]

Jeffrey Altman wrote:
> alextc at microsoft.com wrote:
>
> >> RFC 4120
> >> http://www.ietf.org/rfc/rfc4120.txt
> >
> > Thanks for the response.
> > Could you, please, provide the section of the document where I could
> > find such a table.
> > I read through RFC but was not able to find the required information.
> > As a matter of fact, when I did a search of the entire document for
> > "RC4", hoping to find the corresponding int key, I found only a single
> > match, which was not really relelevant to the information I am looking
> > for.
> > Thanks in advance.
> > Alex.
>
> RFC 3961 Section 8
> http://www.ietf.org/rfc/rfc3961.txt

Thanks a lot.
I have one more question, regarding the negative values in my krb5kdc.
So if I look at the entry in the log:
Jul 17 11:19:57 rh01.mit.contoso.com krb5kdc[1864](info): TGS_REQ (7
etypes {23 -133 -128 3 1 24 -135}) 192.168.15.103: ISSUE: authtime
1153149597, etypes {rep=
23 tkt=23 ses=23},
By looking at the table in RFC 3961 I know that the issued token was
encrypted with RC4, but when I look at the etypes proposed by the
client (etypes {23 -133 -128 3 1 24 -135})  I see some negative values
that are not in the RFC 3961 table. The client is Windows XP
workstation SP2. Does anybody know what those negative values
represent?
Thanks.
Alex.