Prob: CreateObject fails after XP SP2

[Tim]

Hi

A custom ASP web application that i have developed has stopped working
after the install of WinXP SP2.

The application breaks on:

Set oMaint = Server.CreateObject("efilingMaintenance.clsMaintenance")

with error message:

The VB Application identified by the event source logged this
Application Maintenance: Thread ID: 4944 ,Logged: MsgBox: , Run-time
error '-2147467259 (80004005)':

Cannot generate SSPI context

i have had a good hunt around, but cant find anything usefull

I cant see what SSPI has to do with anything as the object doesnt even
get instantiated, let alone contact the database!

any ideas