1. By default, IIS web server allows for limited file size to be uploaded to the web server. For IIS 6 and IIS 7, the default maximum file upload size is 4 MB and 28.6 MB respectively. IIS 7 returns a 404 error (HTTP Error 404.13 - CONTENTLENGTHTOOLARGE) if someone uploads something larger than 30MB.
2. Aug 21, 2006  Customer was using an ASP page which uses Response.BinaryWrite method to pull up the file from a COM+ component, it is not pulling the files which are greater than 32 MB in size. It is pulling the file of 31 MB. Not sure whether it is related to IIS or ASP or the Component written in C#.
3. May 02, 2014  In the box under Value data, type a value that is larger than the size of the file that you want to download. Note The default value for the file size limit is 50000000 bytes.
4. I wanted to download some backups (about 4.5Gb in size) via HTTP and was surprised that IIS7 didn't allowed me to do so. IIS7 - how to configure server to serve large (GBs) files? Ask Question Asked 6 years, 9 months ago. Active 6 years ago. If you set the limits to the maximum values, IIS will interpret them as 'unlimited', at least.
5. Apart from general settings that limit the size of files you upload to KMP, IIS7 has its own setting for that. It is 'Maximum allowed content length' setting in Request Filtering rules. Follow these steps to increase maximum allowed size for file uploads on IIS7. Open IIS Manager. Select the website with KMP. Double-click on 'Request Filtering'.

• Iis File Upload
• Iis Large File Upload
• Iis 8 Download File Size Limit
• Dropbox File Size Limit
• Iis 7.5 File Download Size Limit

Dec 11, 2007  maxRequestLength - Attribute limits the file upload size for ASP.NET application.The size specified is in kilobytes. The default is '4096' (4 MB). Max value is '1048576' (1 GB) for.NET Framework 1.0/1.1 and '2097151' (2 GB) for.NET Framework 2.0.

I am developing project in asp.net, c# 2010. In that i am trying to download mp3 files in .zip format. It works fine in local PC even if size is between 80 to 150 MB. It also works on live server while .zip file size is between 10 to 20 MB but now i have uploaded files that are between 80 to 150 MB and It not works and not gives any error only loading page. Page is loading may be because i have set maximum timeout in web.config file.

Downloading code

Web.config

Don't know what's the reason. Please help me to solve this error. If you have alternate solutions it would be great.

Edit

Thanks

Mayank ModiMayank Modi

3 Answers

Pirates online game disney. If you use Response.TransmitFile(Server.MapPath(virtualpath)), it will turn buffering off and you don't have to write to the output stream.

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Iis File Upload

There is a IIS setting called:

maxAllowedContentLength

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Optional uint attribute.

Specifies the maximum length of content in a request, in bytes.

The default value is 30000000.

Guess you have to change your IIS settings to allow Files over 30MB.

In webconfig the maxRequestLength is measured in kB!

Open the file C:WindowsSystem32inetsrvconfigapplicationHost.config and find the line:

Set the overrideModeDefault property to Allow. So now the line should look like:

<section name='requestFiltering' overrideModeDefault='Allow' />

Not the answer you're looking for? Browse other questions tagged asp.netc#-4.0download or ask your own question.

I've recently worked on a very interesting file upload issue where my customer was hitting a 2 GB upload limit using Internet Explorer, IIS 7.5 and a simple file upload form with a file input element.
After doing some research and a couple of tests, I was able to build a simple 'POC' project showing how to upload up to 4 GB using the following configuration:

• Internet Explorer 10 client
• Windows 8 / IIS 8
• Application configured to run in .Net 4.5 Classic Pipeline

<?xml version='1.0' encoding='UTF-8'?>
<configuration>
<system.web>
<httpRuntime maxRequestLength='2147483647' />
<httpModules>
<add name='UploadModule' type='UploadModule,UploadModule'/>
</httpModules>
</system.web>
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength='4294967295'/>
</requestFiltering>
</security>
</system.webServer>
</configuration>

• simple upload.aspx test page :

<!DOCTYPE html>
<html xmlns='http://www.w3.org/1999/xhtml'>
<head>
<meta charset='utf-8' />
<title>Upload Test</title>
</head>
<body>
<form name='frm' action='upload.aspx' enctype='multipart/form-data' method='POST'>
<h1>Choose file and click upload</h1>
<input type='file' name='SourceFile_1' size='40' />
<br />
<div>
<input type='submit' value='Upload' />
</div>
</form>
</body>
</html>

• Upload module (mainly built from code posted here : http://dotnetslackers.com/Community/blogs/haissam/archive/2008/09/12/upload-large-files-in-asp-net-using-httpmodule.aspx)

[privatevoid Application_BeginRequest(object theSender, EventArgs theE)]

{
HttpApplication httpApp = theSender as HttpApplication;
HttpContext context = ((HttpApplication)theSender).Context;
IServiceProvider provider = (IServiceProvider)context;
HttpWorkerRequest httpWorkerReq = (HttpWorkerRequest)provider.GetService(typeof(HttpWorkerRequest));
long receivedBytes=0;
long initialBytes=0;
byte[] buffer = newbyte[10 * 1024 * 1024];

if (httpApp.Request.HttpMethod 'POST')
{
// get the total body length
UInt32 requestLength = (UInt32) httpWorkerReq.GetTotalEntityBodyLength();
// Get the initial bytes loaded
if (httpWorkerReq.GetPreloadedEntityBody() != null)
receivedBytes = httpWorkerReq.GetPreloadedEntityBody().Length;
if (!httpWorkerReq.IsEntireEntityBodyIsPreloaded())
{
// Set the received bytes to initial bytes before start reading
do
{
// Read another set of bytes
initialBytes = httpWorkerReq.ReadEntityBody(buffer, buffer.Length);
// Update the received bytes
receivedBytes += initialBytes;
System.Diagnostics.Trace.WriteLine('#bytes read: ' + receivedBytes.ToString());
}
while (initialBytes > 0);
}
System.Diagnostics.Trace.WriteLine('Request Length=' + requestLength.ToString() + ' Total bytes read=' + receivedBytes.ToString());
}
}

Iis Large File Upload

• Debugview (http://technet.microsoft.com/en-us/sysinternals/bb896647.aspx) to check for upload success

If you use the above settings/pages and upload a large file (nearly 3GB in this example), you should see the following in DebugView :

Iis 8 Download File Size Limit

I believe the 4 GB upload barrier using input type=file element is impossible to exceed for the following reasons :

• there is a 4 GB upload limit in Internet Explorer: http://blogs.msdn.com/b/ieinternals/archive/2011/03/10/wininet-internet-explorer-file-download-and-upload-maximum-size-limits.aspx
  If you try to upload more than 4 GB with IE10 and above sample, IE will simply refuse to upload anything (you won't even see a POST request being sent!)
• requestFiltering doesn't allow to specify more than 4 GB for maxAllowedContentLength
• maxRequestLength is expressed in kilobytes and the limit specified above is nearly 2 TB. ASP.NET 2.0 doesn't allow a value greater than 2097151 KB (approx. 2 GB) and trying to set a greater value will fail with the following error :
  'The value for the property 'maxRequestLength' is not valid. The error is: The value must be inside the range 0-2097151'
• If the application is running under the NET 4.5 Integrated Pipeline, upload will not work above 2G and the following error will be sent by IIS: 'HTTP 400.0 – Bad Request ASP.NET detected invalid characters in the URL.'.

  Debugging of the error a little bit further shows that its cause is the following stack and exception:

  0:034> !clrstack

  0000003a5f72e048 000007fb7e99811c [HelperMethodFrame: 0000003a5f72e048] System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32, IntPtr)
  0000003a5f72e130 000007fb58087ab1 System.Web.Hosting.IIS7WorkerRequest.ReadRequestBasics()
  0000003a5f72e1d0 000007fb5806ee45 System.Web.Hosting.PipelineRuntime.InitializeRequestContext(IntPtr, Int32, System.Web.
  Hosting.IIS7WorkerRequest ByRef, System.Web.HttpContext ByRef)
  0000003a5f72e240 000007fb5806e45f System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(IntPtr, IntPtr, IntPtr, Int32)
  0000003a5f72e3d0 000007fb5806e2e2 System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(IntPtr, IntPtr, IntPtr,Int32)
  0000003a5f72e420 000007fb587cb781 DomainNeutralILStubClass.IL_STUB_ReversePInvoke(Int64, Int64, Int64, Int32)
  0000003a5f72e668 000007fb66959863 [ContextTransitionFrame: 0000003a5f72e668]

  0:034> !dso
  

  0000003A5F72DEC0 0000003893849348 System.ArithmeticException
  

  When the integrated pipeline is used, we go though webengine code (webengine4!MgdGetRequestBasics) which doesn't support more than 2 GB content-length and a System.ArithmeticException exception is raised which subsequently cause the HTTP 400 error. With the classic pipeline, we don't use webengine4 but the old ASPNET_ISAPI model and we don't hit the above issue.

If you need to upload more than 4 GB (or 2 GB in case ASP.NET 4.5 integrated pipeline or ASP.NET 2.0), I believe you'll need to use specific client and server code in order to use chunked-encoding and read data using GetBufferlessInputStream.

To perform the upload tests, I've used a quite recent PC (4 processor machine with 16 GB of RAM, 1 GB/s Lan, SSD storage, all the tests were made locally). With such configuration, the upload of 3 GB takes less than 30 seconds. Beyond memory/hardware requirements and impacts (upload of very large file clearly puts a lot of 'pressure' on the server machine), my test scenario was not really realistic. In a real world scenario, I should have probably to tweak some settings at various levels (IE, http.sys, IIS, asp.net, etc…etc). Therefore, even if it is technically possible to upload up to 4 GB using above scenario, you may want to consider other means to build a more 'robust' upload (using range request for example or using other protocols (FTP, WEBDAV…etc)).

Dropbox File Size Limit

Happy Uploading!

Iis 7.5 File Download Size Limit

Emmanuel Boersma