file.exists across network

[lrw]

I have read numerous posts regarding the issues of
accessing network resources via impersonation, but have
yet to resolve the issue for myself.

Simply, I wish to return System.IO.File.Exists
("\\myserver_1\myshare\myfolder\myfile.doc") within an
ASP.NET web application that sits
on "\\myserver_2"(windows server 2003). The application is
using integrated windows authentication only (anonymous is
off), and impersonation is enabled in web.config. The
security on the targeted network share includes a network
group with full control to all of its children, and I am a
member of this group. However, I continue to receive a
login prompt as this code executes.

PS. the code executes perfectly from my desktop(localhost -
win2k).

What am I missing?

LRW.