Re: Impersonation fails when accessing remote files.

From: simonc (simon.c_at_gordian.co.uk)
Date: 11/08/04 

Date: Mon, 08 Nov 2004 11:35:18 -0500

Paul,
thanks for the prompt reply. I have already tried using the logon user API
and the result is the same - IE the credentials used to logon are the
aspnet ones not the impersonated ones. Here's the code (Impersonate is
just a wrapper class for the MS standard example of using the logon user
API):

'**** CODE ****
Dim impersonation As Impersonate = New Impersonate

'WhoAmI - will be 'aspnet'
Dim userStr As String = impersonation.WhoAmI

impersonation.SetIdentity(user, pass, domain)
impersonation.BeginImpersonation()

'WhoAmI - will be 'user'
userStr = impersonation.WhoAmI

Dim myFileWebResponse As System.Net.FileWebResponse

Try
   Dim url As String = _
      "file://192.168.0.1\path\test.pdf"
   Dim myFileWebRequest As System.Net.FileWebRequest = _
      CType(System.Net.WebRequest.Create(url), _
      System.Net.FileWebRequest)

   'This call will fail with an access denied exception.
   'Server logs show that user 'aspnet' tried to connect.
   myFileWebResponse = _
      CType(myFileWebRequest.GetResponse(), _
      System.Net.FileWebResponse)
Catch ex As System.Net.WebException

Catch ex As UriFormatException

End Try

impersonation.EndImpersonation()

'WhoAmI - back to 'aspnet'
userStr = impersonation.WhoAmI
'***** END CODE ******

I guess I'll have to look into delegation...

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