DllImport on framework 1.1, in IIS 6 (Windows Vista)

Greetings,
I have a problem, and been around it for some days without finding a solution.

I have an aspnet 1.1 application that works perfectly on Windows XP, Windows 2000 and Windows 2003.

When trying on Windows Vista (set application for aspnet 1.1 on IIS), the application crashes Internet Explorer with the message:
"IIS Worker Process stopped working and was closed"

Doing some debug, I found that the errors is caused when accessing a method from an external dll (win32).
I use dllimport to define the method, something like:

[DllImport("name.dll", CharSet=CharSet.Ansi, EntryPoint="functionname")]
public static extern string functionname (string SomeParameter);


I've searched a lot for a solution, and tried different aproaches, like giving full access to dll file to everyone, impersonating, enabeling unmanaged code debug, moving dll to system32 path, checking that the application is with Full trust level on IIS, etc.

I know the problem is not the dll path, since aspnet is finding it (if I remove the dll from bin folder, it throws an error of file not found).


I thought that it could be a problem with the dll on vista, but if I create a winform application, the dll works fine.

Sorry if this post is in the wrong group, but I think it has to do with aspnet security.


Appreciate any help on this subject,

Nelson R.

.

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