ServerXMLHTTP Kerberos Principal "0"

[Paul Bacelar]

I have a problem with Windows integrated authentication and Kerberos. I use
the object COM ServerXMLHTTP of MSXML3. On the Open method which requires
the login password of the user, I use NULL and NULL so that the integrated
authentication of Windows should be used. My application goes perfectly if
I give the login and the password but I cannot know the password of the user
during the production: - ( .

The network sniffer traces enables me to see the requests for authentication
Kerberos on the network. If I didn't provide the login in the call to Open
method, the request of Kerberos authentication towards my domain controller
uses a strange login (Principal)"0" instead of the login of the user owner
of the thread calling the Open method.

My questions are:

Why the Windows integrated authentication doesn't work with MSXML3.

Where is this login "0" coming from, to be able to determine the problem of
authentication?

If somebody already succeeded in using the integrated authentication with
MSXML, it can say to me where I going to the wrong way?

Paul Bacelar.