Maximum request length exceeded.

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>

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.

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

This is explained [here][1].

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


[1]:

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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)

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.)

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>

Caution: As some have pointed out, there was already an entry for <httpRuntime.. in my web.config file. I had blindly copied and pasted another httpRuntime from here and it crashed the whole site.