Question

Problems downloading large files

Asked by: RNGAdmin

One of my users can't download over 5 MB files (ppt). Smaller files are fine. I've tested all IE browsers and Firefox and it works. User uses IE7. It's a local issue obviously specific to that particular user.

Server environment: IIS 7, asp.net, framework 2.0. Any ideas how i can troubleshoot it?

protected void Page_Load(object sender, EventArgs e)
{
...
if (metadata != null)
{
                    Response.ContentType = FileExtUtils.GetMimeType(metadata.FileExt);
                    Response.AppendHeader("Content-Disposition", 
                        String.Format("attachment; filename=\"{0}\"", Path.GetFileName(metadata.FileName)));
                    Response.Expires = 0;
                    Response.Buffer = true;
                    Response.Clear();
                    Response.WriteFile(VirtualPathUtility.ToAppRelative(AppMembers.GetBinaryVirtualPath()
                        + "\\" + Path.GetFileName(metadata.FileName)));
                    HttpContext.Current.ApplicationInstance.CompleteRequest();
}
 
}

                                  
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Asked On
2009-08-13 at 09:20:15ID24650358
Tags

asp.net file download

Topic

Programming for ASP.NET

Participating Experts
2
Points
0
Comments
6

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Answers

 

by: rkworldsPosted on 2009-08-13 at 09:48:10ID: 25090379

Hi

In the web.config file - add


<httpRuntime maxRequestLength="51200" />

Or

<httpRuntime executionTimeout="999999" maxRequestLength="51200" />

Note : 51200/1024 Kb= MB

 

by: RNGAdminPosted on 2009-08-13 at 10:08:23ID: 25090579

rkworlds, thanks for quick response! Correct me if i am wrong but as far as i know maxRequestLength is for uploads, not downloads and designed to prevent DOS attacks. My user has issues downloading files.

 

by: samtran0331Posted on 2009-08-13 at 10:33:54ID: 25090826

>>It's a local issue obviously specific to that particular user.

So if this particular user uses FireFox, it works? it's only IE7 that is "broken"?
If it's that specific to one user and one browser...have you done the usual PC maintenance?
(Clear out the browser cache, empty recycle bin, defrag, etc.)

 

by: RNGAdminPosted on 2009-08-13 at 13:26:04ID: 25092520

i did all that. no luck. any other ideas?

 

by: samtran0331Posted on 2009-08-13 at 13:54:14ID: 25092867

Just to confirm...this user can use a different browser and it works...it's only when this user uses IE7 that it doesn't work?

 

by: RNGAdminPosted on 2009-08-17 at 11:51:16ID: 25117152

The issue had been resolved. But to answer your question user could not use any browser apparently not just IE7. She mentioned IE7 but testing it in Firefox and IE8 didn't work as well. Just for her. We obviously tested it internally in all browsers and it was working fine. While troubleshooting it I noticed errors in our app log
-------------------------------------------
Exception: System.AccessViolationException
Message: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
-------------------------------------------
I reinstalled .net framework on the server. Second thing was that I changed Response.WriteFile to Response.TransmitFile. One of those 2 things fixed the problem.

20120131-EE-VQP-002

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