problem writing a file

From: Iain A. Mcleod (mcleodia_at_dcs.gla.ac.uk)
Date: 09/27/04 

Date: Mon, 27 Sep 2004 19:55:13 +0100

Hi,
I'm really stuck with this one - wondering if you can spot the problem?
I think that it's a webserver problem that goes deeper than web.config.
I've not been able to write to a file on a network share via ASP.NET. The
network share is not the same as the webserver.

relevant section of web.config:
<appSettings>
                <!-- the location we cannot write to. My staging server
doesn't have write permissions here, but I do if authenticating as
myself -->
                <add key="ProjectCollection"
value=\\my_server\userhome\MyAccount\websiteTests\test.txt />
                </appSettings>
                <!-- Neither of these work!
                I have write perms here for my user ac*** and believe that
my staging server has write perms here too
                add key="ProjectCollection"
value=\\my_server\commondocuments\websiteTests\test.txt />
                -->
</appSettings>
  <system.web>
        <!-- I have also tried "None" here -->
    <authentication mode="Windows" />

        <!-- I have tried leaving this out -->
    <identity impersonate="true" />

    <authorization>
        <allow users="mydomain\myusername" />
        <deny users="*" />
        <!-- I have tried allow users="*" but I think that then my server
tries to authenticate as ASPNET. This certainly should not access my home
folder, but should??? access the common share. I believe that my
administrator has set up access privs for my server on the common share. It
doesn't access it however! -->
        </authorization>
        </system.web>
Relevant code:
Private Sub btnSearch_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles btnSearch.Click
            'identity we are running as - 2 ways of getting the same
information
                        ' returns my username if I am impersonating and
authenticating in web.config
                        'however, still cannot write to either folder no
matter what I am impersonating or not
            Trace.Write(Page.User.Identity.Name)

Trace.Write(System.Security.Principal.WindowsIdentity.GetCurrent().Name)
            'filename we are trying to write to
            Dim strFileName As String =
ConfigurationSettings.AppSettings("ProjectCollection")
            Trace.Write(strFileName)
            'fails here. This creates a file in location specified by
Config setting above
            Dim fs As FileStream = New FileStream(strFileName,
FileMode.Append)
            Dim w As New StreamWriter(fs)
            w.WriteLine("Test")
            w.Close()
            fs.Close()
End Sub
Any Ideas?
Many thanks
Sorry for long post
Iain

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