The application is a simple form of three textbox controls that results
in writing an XML file to the file system of the application root when
it runs on the local development machine.

I've just used FTP to deploy this as my first ASP.NET application using
a hosting provider using W2003 IIS6 noting the host provides a control
panel that allows me to set the application root as a virtual application.

The XML file is not being created and the application bombs out.
I have no idea how to respond to the error message that follows...

<errorStart>
Exception Details: System.UnauthorizedAccessException: Access to the path
"c:\xxx\xxx\xxx\csgallagher\xxx\SomeFile.xml" is denied.

ASP.NET is not authorized to access the requested resource. Consider
granting access rights to the resource to the ASP.NET request identity.
ASP.NET has a base process identity (typically {MACHINE}\ASPNET on IIS 5 or
Network Service on IIS 6) that is used if the application is not
impersonating. If the application is impersonating via <identity
impersonate="true"/>, the identity will be the anonymous user (typically
IUSR_MACHINENAME) or the authenticated request user.
</errorEnd>

Using the hosting control panel I tried giving ASPNET full permission on
the application's folder. No joy.  I tried adding <identity
impersonate="true"/>
to the web.config but learned it results in a challenge for credentials. I
used
my account credentials which were refused confusing me even further as
the error message indicates using impersonation as noted used the identity
of
the anonymous IUSR_MACHINENAME user account.

I have no idea what to try next.