Maximum request length exceeded.

asp.netIisFile Upload

asp.net Problem Overview

I am getting the error Maximum request length exceeded when I am trying to upload a video in my site.

How do I fix this?

asp.net Solutions

Solution 1 - asp.net

If you are using IIS for hosting your application, then the default upload file size is 4MB. To increase it, please use this below section in your web.config -

<configuration>
    <system.web>
        <httpRuntime maxRequestLength="1048576" />
    </system.web>
</configuration>

For IIS7 and above, you also need to add the lines below:

 <system.webServer>
   <security>
      <requestFiltering>
         <requestLimits maxAllowedContentLength="1073741824" />
      </requestFiltering>
   </security>
 </system.webServer>

Note:

  • maxRequestLength is measured in kilobytes
  • maxAllowedContentLength is measured in bytes

which is why the values differ in this config example. (Both are equivalent to 1 GB.)

Solution 2 - asp.net

I don't think it's been mentioned here, but to get this working, I had to supply both of these values in the web.config:

In system.web

<httpRuntime maxRequestLength="1048576" executionTimeout="3600" />

And in system.webServer

<security>
    <requestFiltering>
        <requestLimits maxAllowedContentLength="1073741824" />
    </requestFiltering>
</security>

IMPORTANT : Both of these values must match. In this case, my max upload is 1024 megabytes.

maxRequestLength has 1048576 KILOBYTES, and maxAllowedContentLength has 1073741824 BYTES.

I know it's obvious, but it's easy to overlook.

Solution 3 - asp.net

It may be worth noting that you may want to limit this change to the URL you expect to be used for the upload rather then your entire site.

<location path="Documents/Upload">
  <system.web>
    <!-- 50MB in kilobytes, default is 4096 or 4MB-->
    <httpRuntime maxRequestLength="51200" />
  </system.web>
  <system.webServer>
    <security>
      <requestFiltering>
        <!-- 50MB in bytes, default is 30000000 or approx. 28.6102 Mb-->
        <requestLimits maxAllowedContentLength="52428800" /> 
      </requestFiltering>
    </security>
  </system.webServer>
</location>

Solution 4 - asp.net

And just in case someone's looking for a way to handle this exception and show a meaningful explanation to the user (something like "You're uploading a file that is too big"):

//Global.asax
private void Application_Error(object sender, EventArgs e)
{
	var ex = Server.GetLastError();
	var httpException = ex as HttpException ?? ex.InnerException as HttpException;
	if(httpException == null) return;

	if (((System.Web.HttpException)httpException.InnerException).WebEventCode == System.Web.Management.WebEventCodes.RuntimeErrorPostTooLarge)
	{
		//handle the error
		Response.Write("Too big a file, dude"); //for example
	}
}

(ASP.NET 4 or later required)

Solution 5 - asp.net

The maximum request size is, by default, 4MB (4096 KB)

This is explained here.

The above article also explains how to fix this issue :)

Solution 6 - asp.net

If you can't update configuration files but control the code that handles file uploads use HttpContext.Current.Request.GetBufferlessInputStream(true).

The true value for disableMaxRequestLength parameter tells the framework to ignore configured request limits.

For detailed description visit https://msdn.microsoft.com/en-us/library/hh195568(v=vs.110).aspx

Solution 7 - asp.net

There's an element in web.config to configure the max size of the uploaded file:

<httpRuntime 
    maxRequestLength="1048576"
  />

Solution 8 - asp.net

To summarize all the answers in a single place:

<system.web>
  <httpRuntime targetFramework="4.5.2" maxRequestLength="1048576"/>
</system.web>

<system.webServer>
  <security>
    <requestFiltering>
      <requestLimits maxAllowedContentLength="1073741824" />
    </requestFiltering>
  </security>
</system.webServer>

Rules:

  • maxRequestLength (expressed in kb) value must match maxAllowedContentLength (expressed in bytes).
  • most of the time your system.web section may already contains an "httpRuntime". set your targetFramework to the version of your .net used.

Notes:

  • default value for maxRequestLength is 4096 (4mb). max value is 2,147,483,647
  • default value for maxAllowedContentLength is 30,000,000 (around 30mb). max value is 4,294,967,295

more info MSDN

Solution 9 - asp.net

maxRequestLength (length in KB) Here as ex. I took 1024 (1MB) maxAllowedContentLength (length in Bytes) should be same as your maxRequestLength (1048576 bytes = 1MB).

<system.web>
   <httpRuntime maxRequestLength="1024" executionTimeout="3600" />
</system.web>

<system.webServer>
   <security>
      <requestFiltering>
          <requestLimits maxAllowedContentLength="1048576"/>
      </requestFiltering>
   </security>
</system.webServer>

Solution 10 - asp.net

It bothered me for days too. I modified the Web.config file but it didn't work. It turned out that there are two Web.config file in my project, and I should modified the one in the ROOT directory, not the others. Hope this would be helpful.

Solution 11 - asp.net

If you have a request going to an application in the site, make sure you set maxRequestLength in the root web.config. The maxRequestLength in the applications's web.config appears to be ignored.

Solution 12 - asp.net

I was tripped up by the fact that our web.config file has multiple system.web sections: it worked when I added < httpRuntime maxRequestLength="1048576" /> to the system.web section that at the configuration level.

Solution 13 - asp.net

I had to edit the C:\Windows\System32\inetsrv\config\applicationHost.config file and add <requestLimits maxAllowedContentLength="1073741824" /> to the end of the...

<configuration>
    <system.webServer>
        <security>
            <requestFiltering>

section.

As per This Microsoft Support Article

Solution 14 - asp.net

I was dealing with same error and after spending time solved it by adding below lines in web.config file

<system.web>
   <httpRuntime targetFramework="4.7.1" maxRequestLength="1048576"/>
</system.web>

and

 <system.webServer>
   <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="1073741824" />
      </requestFiltering>
    </security>
</system.webServer>

Solution 15 - asp.net

I can add to config web uncompiled

<system.web> 
  <httpRuntime maxRequestLength="1024" executionTimeout="3600" /> 
  <compilation debug="true"/> 
</system.web> 
<security> 
  <requestFiltering> 
    <requestLimits maxAllowedContentLength="1048576"/> 
  </requestFiltering> 
</security>
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QuestionSurya sasidharView Question on Stackoverflow
Solution 1 - asp.netSachin ShanbhagView Answer on Stackoverflow
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