WSE 2.0 Kerberostoken creation on IIS 5.0/win2k fails

[Shikari Shambu]

Hi,
I have a ASP.NET web app in which I am trying to create a Kerberos token
using the following code.

Microsoft.Web.Services2.Security.Tokens.KerberosToken kt = new
Microsoft.Web.Services2.Security.Tokens.KerberosToken("host/" +
ConfigurationSettings.AppSettings["ws-host"]);

This in turn returns

The Kerberos credential handle could not be acquired. The
AcquireCredentialsHandle call returned the following error code: A specified
logon session does not exist. It may already have been terminated

Note that the same code works in Windows 2003 server with IIS 6.

..NET framework version 1.1

Any help is greatly appreciated.

TIA