title: ApplicationPoolIdentity user cannot modify files in shared folder in Windows Server 2008
body: <p>I am creating directories, and writing files to a shared folder within my web application that is being hosted on Windows Server 2008.  I am running the application pool with an identity of ApplicationPoolIdentity.  </p>
  
  <p>To give you an idea of my setup so far..  I've set permissions to the root of my web application root directory to two different users: "IUSR" and "IIS APPPOOL\MYPOOL".  I'm using the name "MYPOOL" as the name of my application pool, so it's easy to reference.  </p>
  
  <p>The application is unable to modify and write to a shared folder.  I right clicked the shared folder that I'm creating directories in and writing to, and clicked on the "Security" tab.  Then I clicked "Edit".  Under objects, I checked "Computer".  Then under LOCATION, I've tried the machine/server running my web application.  I wasn't able to find my "MYPOOL" user however under the users.  I tried to follow this link, but it wasn't very complete.  I don't know which user to use.  I continue to get a System.IO exception because it doesn't have permissions.  Once I know which user to use, I will have to give "Modify" permissions to the "ExportPath" directory.</p>
  
  <p><a href="http://grekai.wordpress.com/2011/05/23/permissions-for-shared-folder-for-iis-7-application-pool-identity-across-domain/" rel="nofollow">http://grekai.wordpress.com/2011/05/23/permissions-for-shared-folder-for-iis-7-application-pool-identity-across-domain/</a></p>
  
  <p><strong>For a quick test, I made a dummy page called FilePermissionsTest.aspx, and put some code to write a file to create a directory and write a file in my Page_Load event of the code behind.  But I haven't gotten far enough to test it.</strong></p>
  
  <p>...</p>
  
  <pre><code>&lt;div&gt;
  Check to see if the file "_File_Permissions_Test.txt" was written to &lt;% Response.Write(Data.ConfigurationHelper.ValueFromConfiguration("ExportPath", Nothing))%&gt; 
  &lt;/div&gt;
  </code></pre>
  
  <p>...</p>
  
  <pre><code>Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
      Dim exportPath As String = Data.ConfigurationHelper.ValueFromConfiguration("ExportPath", Nothing)
      If exportPath = String.Empty Then Return
      Dim exportDirectory As DirectoryInfo = Directory.CreateDirectory(exportPath)
  
      Dim writer As StreamWriter = File.CreateText(Path.Combine(exportDirectory.FullName, "_File_Permissions_Test.txt"))
      writer.WriteLine("TESTING... " + DateTime.Now().ToString)
      writer.Flush()
      writer.Close()
  
  End Sub
  </code></pre>