Do you mean IIS? I dont have any experience with ISS, but here is a few questions/thoughts anyway:
What happens when you manually append a querystring? do you have acces to that variable? - for example if you type in 'page.php?test=cool' and in the page 'page.php' have the script 'echo $_GET['test']'
What error do you get (if any).
Does POST work fine?
is register globals on or off?
what version of php is this?
just need a few more details
