ASP.NET W2K3 UNC: Server Error in '/'

I have problem with ASP.NET files on a NAS Appliance (W2K)
using UNC, through a W2K3 PDC IIS6, while working fine
when the virtual dir is located on the W2K3 (Standard)
Server itself.

The aspx files on the NAS generate the following error;
Access to the
path "C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322
\Temporary ASP.NET Files\root\9115b622\612bc982" is denied.
(I assume it's looking for this path on the W2K3 server,
right?)

What kind of permission should I apply and where to get
this working.

Thanks in advance,
Augustus