Secure PDF files in Asp.net

Hi
We are using forms authentication in .net to restrict access to tthe site.  We also need to restrict access to a directory containing PDF files.

I have done the following
Added the web.config file in the attached code snippet to this directory
In the mappings section of IIS app configuration I have added .pdf as an application extension.
restarted iis

However what happens is this.

When clicking on a link to one of the secured pdf files, we are redirected to the login page which is what I want to happen.

However, once logged in, the links to the pdf files cause a 'cannot display page' error in ie.

So the files are being secured but they can no longer be displayed even when logged in

Anyone any ideas

Wing

<?xml version="1.0" encoding="utf-8"?>
<configuration>
	<system.web>
		<authorization>
			<deny users="?" />
		</authorization>
	</system.web>
</configuration>

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