Issue with Response.TransmitFile - debugging

Question

I have been working on an issue for the past 2 days.I have tried to debug in every way possible but in vain.
Everything works fine on my local.But on production this fails.
Here is a brief description about the problem.
I have a download button and when I click that button I intend to download a file from a server.
protected void Download_Click(object sender, EventArgs e)
{
Button downloadButton = sender as Button;
string filePath = downloadButton.CommandArgument;
string stuid = Session["browse_files_for_student"].ToString();
string stuUsername = MyHelper.GetUsernameForStudentID(stuid);
MyHelper.LogAccess(User.Identity.Name, StudentUsername.Text, filePath, MyHelper.LogAccessType.Read);
FileInfo file = new FileInfo(filePath);
// Download the file
Response.Clear();
Response.AppendHeader("content-disposition", "attachment; filename=" + file.Name);
try
{
Response.TransmitFile(filePath);
}
catch (IOException error)
{
Response.Cookies.Add(new HttpCookie("global_last_error", "The file is in use by another process."));
Response.Redirect("~/Public/KnownError.aspx");
}
Response.End();
}
I see on the Event Viewer that it generates:
TransmitFile failed:FileName:dsdfsfd.doc,Impersonation Enabled:0,Token Valid:1 HRESULT:0x8007052e.
Environment: The website is deployed on a Windows 2000 server.
Any help and comments would be appreciated.
Thank you.

Answer 1

The account under which your application is running (probably IIS pool account) does not have access to the file that you are trying to send. The error code 0x8007052e means:
Error code: (HRESULT) 0x8007052e (2147943726) - Logon failure: unknown user name or bad password.
In the future you can check the error code using for instance cdb command (cdb is a part of the freely available Windows Debugging Tools):
cdb notepad.exe
And then after it has started:
0:000> !error 0x8007052e
Error code: (HRESULT) 0x8007052e (2147943726) - Logon failure: unknown user name or bad password.
Hope it helps :)