We have an ASP.Net web app which uses a separate DLL to perform vital functions, and the DLL needs access to the registry in order for it to function. When the web app is run on the server using localhost the DLL functions as it should, but when the web app is accessed from outside the firewall the DLL fails.

How can we provide the necessary permissions to the DLL so that it will function when the website is accessed from outside the firewall???

Windows Server 2008 R2
IIS 7