Copy data to a file server with ASP .NET 2.0

[Lorenzo Soncini]

Buongiorno,
I have a problem with an ASP.NET 2.0 and Wisual studio 2005 on a Windows
2003 enviroment.
I have an ASPNET Web Apllication who create some directory and copy some
file using an ASPX page on a shared folder off our file server.

On a IISSERVER who run the WebApplication on a specific application pool in
IIS 6.0 (Windows 2003), I have changed the identity of the Application pool
and now run as <DOMAIN\UsersAccount(if I look in the task manager I see
the correct owner of the peocess w3wp.exe is <DOMAIN\UsersAccount>)
On a file server, is a Windows 2003 cluster, the user <DOMAIN\UsersAccount>
have the correct permission on the correct share

I have prepared a text page who only create a directory by the the command :
System.IO.Directory.CreateDirectory(\\SERVER\share \directory)

If I access on my dev machine with <DOMAIN\UsersAccountand run the
"ASP.NET application" using the embedded server in VS2005 all work fine.
But the same application run on IISSERVER generate the error "access denied
on \\SERVER\share\directory"

In the log I see two row of the POST command of the page: the first without
the username (there is a - symbol) and the second with the correct user
name.

Any suggestion?
Sorry for my english, I'm studing it :-)
Lorenzo Soncini
Trento (TN) - Italy