How can I disable parent paths in IIS?

Start the Internet Services Manager (Start - Programs - Administrative Tools - Internet Services Manager)

Right click on the web site and select properties

Select the 'Home Directory' tab

Click the 'Configuration' button under the Application Settings

Select the 'App Options' tab

Blank the 'Enable parent paths' box and click Apply
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If there are any child nodes affected they will be listed, select and click OK

Click OK to all other dialog boxes