WSE 2.0, ASP.NET, Kerberos Token on IIS 5.0 Win 2k

[Shikari Shambu]

Hi,
I have an ASP.NET application running on IIS 5.0 on win 2k trying to
access a web service on win 2k3 to which it tries to pass the kerberos
token.

I get the following error when I try to do this -

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.

I am not explicitly using any constrained delegation stuff (unless WSE 2.0/
web service call is by default a constatined delegation call). Is there a
way to troubleshoot this eror.

TIA