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RequestSizeLimit(100_000_000) not working on IIS

I have a rest API using .net 5.0. I want to use [RequestSizeLimit(100_000_000)] in just one endpoint. When using Kestrel it works, but I want to use it in IIS. I'm missing something? Important: My project has no web.config! None of the solutions showed here: Increase upload file size in Asp.Net core solved my problem.

The RequestSizeLimit attribute allows you to define the maximum request size within your code but it is still limited by maximum request size supported by the server itself, so you can try to set the request size through the maxAllowedContentLength property in iis.
You can try to create a web.config file with the following content:
<system.webServer>
<security>
<requestFiltering>
<!-- This will handle requests up to 50MB -->
<requestLimits maxAllowedContentLength="52428800" />
</requestFiltering>
</security>
</system.webServer>

Rest Api Arguments in in C#/ IIS seems too long

I'm totally new in web development and I tried to create a simple rest api in vs2019/windows server 2016 for evaluation purpose.
My case/issue is as follows. I have a simple controller which has a 2 argument(string, string) method. If the whole request utf8 string is > 2101 characters the server returns a 404 in general.
I test this limitless time, with a dummy ("AAAAA.....") request string. 2002 length fails and 2001 length works. I tried to fix web.config but without luck, now I have a maxQueryStringLength exception.
Can anyone point me to the right direction?

In your site web.config, add the following configuration (modifying existing elements when they are present, otherwise adding new elements):
<system.webserver>
<security>
<requestFiltering>
<requestLimits maxUrl="65535" maxQueryString="65535"/>
</requestFiltering>
</security>
</system.webServer>
and
<system.web>
<httpRuntime maxRequestLength="65535" maxUrlLength="65535" maxQueryStringLength="65535" />
</system.web>
do not forget to restart the site or iis after doing changes.

Large file doesn't upload in ASP.NET

I have a asp.net web form app, i'm trying to upload a large file (13 mb) in a web form with a FileUpload control, when i press the submit button the web browser starts to upload the file. But, when the web browser finish the upload the app crash without reason, and doesn't lauch any exception, and not enter to the click event code (c#) of the submit button. In my web.config i have set the maxAllowedContentLength option and the maxRequestLength option.
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="52428800" />
</requestFiltering>
</security>
<httpRuntime targetFramework="4.5" executionTimeout="900" maxRequestLength="2097151" />
This is only happening in the web server(Windows Server 2012), in my local server this is not happening. In the webserver show a default error (I don't manage the server, so i can't see what custom error is happening)
i don't know why this is happening, because in the web server are apps with file upload options even more bigger.
Thanks for your help.

Modify your web.config by following Stricture, Here I'm using max File request length 13 MB & max Allowed Content Length 1 GB.
Now change Behind the <system.web> in web.config
<httpRuntime targetFramework="4.5" maxRequestLength="13631488" executionTimeout="9000" useFullyQualifiedRedirectUrl="false" minFreeThreads="8" minLocalRequestFreeThreads="4" appRequestQueueLimit="1000" />
And Behind the <system.webServer> in web config write this Code
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="1073741824" />
</requestFiltering>
</security>
Thanks

the problem was a restriction on the server by the admin that doesn't allow upload large files. All the configuration given in this thread are correct.

It looks like you're missing the opening "security" tag in your web.config
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="52428800" />
</requestFiltering>
</security>
</system.webServer>

If your maxAllowedContentLength has a big value, your executionTimeout must be big, too!
It work in local because you don't need a long time to copy file in your hard.
But when you upload your site in server, you need more executionTimeout.

IIS7 - Webrequest failing with a 404.13 when the size of the request params exceeds 30mb

I have a simple webmethod
[WebMethod]
public int myWebMethod(string fileName, Byte[] fileContent)
However, whenever I pass a byte array which is larger than 30mb, I get the error:
HTTP Error 404.13 - Not Found
The request filtering module is configured to deny a request that exceeds the request content length.
My web.config is as follows:
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0"> </compilation>
<authentication mode="Windows" />
<httpRuntime useFullyQualifiedRedirectUrl="true"
maxRequestLength="102400" requestLengthDiskThreshold="102400"
/>
<pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID" />
</system.web>
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="104857600"/>
</requestFiltering>
</security>
</system.webServer>
</configuration>
I've searched around, and the most common cause of this problem is the maxAllowedContentLength property being 30mb by default. However, I have set this to be 100mb, as well as the maxRequestLength property for httpRuntime.
I can't find a solution anywhere which isn't setting one of the properties I've already tried above. Is there something I have missed?

You problem may lie in the fact that settings made in the web.config file may be superseded by corresponding settings present in both the applicationhost.config and machine.config files.
If you have access to these, check if the overrideModeDefault property of the corresponding sections are set to Allow, as in the following example:
machine.config
<requestFiltering overrideModeDefault="Allow">
<requestLimits maxAllowedContentLength="104857600"/>
</requestFiltering>
AFAIK there is no way to override these settings if you don't have access to the corresponding configuration file.
You may find more information about system-wide configuration and settings override here, here and here - and a very similar case here.

This is pretty old. But I have the same problem today. To fix this, you need to make the necessary setting changes in web.config, then deploy to the web server. The important part is that you need to re-deploy your application to the web server. By doing so, the IIS settings are updated for you. Depending on how you do your deployment, you may need to delete your web application from the web server first, then deploy again. Updating web.config in place won't fix the problem. Hope this helps others with the same problem.

How to increase the max upload file size in ASP.NET?

I have a form that excepts a file upload in ASP.NET. I need to increase the max upload size to above the 4 MB default.
I have found in certain places referencing the below code at msdn.
[ConfigurationPropertyAttribute("maxRequestLength", DefaultValue = )]
None of the references actually describe how to use it, and I have tried several things with no success. I only want to modify this attribute for certain pages that are asking for file upload.
Is this the correct route to take? And how do I use this?

This setting goes in your web.config file. It affects the entire application, though... I don't think you can set it per page.
<configuration>
<system.web>
<httpRuntime maxRequestLength="xxx" />
</system.web>
</configuration>
"xxx" is in KB. The default is 4096 (= 4 MB).

For IIS 7+, as well as adding the httpRuntime maxRequestLength setting you also need to add:
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="52428800" /> <!--50MB-->
</requestFiltering>
</security>
</system.webServer>
Or in IIS (7):
Select the website you want enable to accept large file uploads.
In the main window double click 'Request filtering'
Select "Edit Feature Settings"
Modify the "Maximum allowed content length (bytes)"

To increase uploading file's size limit we have two ways
1.
IIS6 or lower
By default, in ASP.Net the maximum size of a file to be uploaded to the server is
around 4MB. This value can be increased by modifying the
maxRequestLength attribute in web.config.
Remember : maxRequestLenght is in KB
Example: if you want to restrict uploads to 15MB, set maxRequestLength to “15360” (15 x 1024).
<system.web>
<!-- maxRequestLength for asp.net, in KB -->
<httpRuntime maxRequestLength="15360" ></httpRuntime>
</system.web>
2.
IIS7 or higher
A slight different way used here to upload files.IIS7 has
introduced request filtering module.Which executed before
ASP.Net.Means the way pipeline works is that the IIS
value(maxAllowedContentLength) checked first then ASP.NET
value(maxRequestLength) is checked.The maxAllowedContentLength
attribute defaults to 28.61 MB.This value can be increased by
modifying both attribute in same web.config.
Remember : maxAllowedContentLength is in bytes
Example : if you want to restrict uploads to 15MB, set maxRequestLength to “15360” and maxAllowedContentLength to "15728640" (15 x 1024 x 1024).
<system.web>
<!-- maxRequestLength for asp.net, in KB -->
<httpRuntime maxRequestLength="15360" ></httpRuntime>
</system.web>
<system.webServer>
<security>
<requestFiltering>
<!-- maxAllowedContentLength, for IIS, in bytes -->
<requestLimits maxAllowedContentLength="15728640" ></requestLimits>
</requestFiltering>
</security>
</system.webServer>
MSDN Reference link : https://msdn.microsoft.com/en-us/library/e1f13641(VS.80).aspx

for a 2 GB max limit, on your application web.config:
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" maxRequestLength="2147483647" executionTimeout="1600" requestLengthDiskThreshold="2147483647" />
</system.web>
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="2147483647" />
</requestFiltering>
</security>
</system.webServer>

I believe this line in the Web.config will set the max upload size:
<system.web>
<httpRuntime maxRequestLength="600000"/>
</system.web>

If its windows 2003 / IIS 6.0 then check out AspMaxRequestEntityAllowed = "204800" in the file metabase.xml located in folder C:\windows\system32\inetsrv\
The default value of "204800" (~205Kb) is in my opinion too low for most users. Just change the value to what you think should be max.
If you cant save the file after editing it you have to either stop the ISS-server or enable the server to allow editing of the file:
(source: itmaskinen.se)
Edit: I did not read the question correct (how to set the maxrequest in webconfig). But this informatin may be of interrest for other people, many people who move their sites from win2000-server to win2003 and had a working upload-function and suddenly got the Request.BinaryRead Failed error will have use of it. So I leave the answer here.

I've the same problem in a win 2008 IIS server, I've solved the problem adding this configuration in the web.config:
<system.web>
<httpRuntime executionTimeout="3600" maxRequestLength="102400"
appRequestQueueLimit="100" requestValidationMode="2.0"
requestLengthDiskThreshold="10024000"/>
</system.web>
The requestLengthDiskThreshold by default is 80000 bytes so it's too small for my application. requestLengthDiskThreshold is measured in bytes and maxRequestLength is expressed in Kbytes.
The problem is present if the application is using a System.Web.UI.HtmlControls.HtmlInputFile server component. Increasing the requestLengthDiskThreshold is necessary to solve it.

Max file size can be restricted to a single MVC Controller or even to an Action.
web.config <location> tag can be used for this:
<location path="YourAreaName/YourControllerName>/YourActionName>">
<system.web>
<!-- 15MB maxRequestLength for asp.net, in KB 15360 -->
<httpRuntime maxRequestLength="15360" />
</system.web>
<system.webServer>
<security>
<requestFiltering>
<!-- 15MB maxAllowedContentLength, for IIS, in bytes 15728640 -->
<requestLimits maxAllowedContentLength="15728640" />
</requestFiltering>
</security>
</system.webServer>
</location>
Or you can add these entries in area's own web.config.

I know it is an old question.
So this is what you have to do:
In you web.config file, add this in <system.web>:
<!-- 3GB Files / in kilobyte (3072*1024) -->
<httpRuntime targetFramework="4.5" maxRequestLength="3145728"/>
and this under <system.webServer>:
<security>
<requestFiltering>
<!-- 3GB Files / in byte (3072*1024*1024) -->
<requestLimits maxAllowedContentLength="3221225472" />
</requestFiltering>
</security>
You see in the comment how this works. In one you need to have the sie in bytes and in the other one in kilobytes. Hope that helps.

If you are using Framework 4.6
<httpRuntime targetFramework="4.6.1" requestValidationMode="2.0" maxRequestLength="10485760" />

You can write that block of code in your application web.config file.
<httpRuntime maxRequestLength="2048576000" />
<sessionState timeout="3600" />
By writing that code you can upload a larger file than now

If you use sharepoint you should configure max size with Administrative Tools too:
kb925083

I have a blog post on how to increase the file size for asp upload control.
From the post:
By default, the FileUpload control allows a maximum of 4MB file to be uploaded and the execution
timeout is 110 seconds. These properties can be changed from within the web.config file’s httpRuntime section. The maxRequestLength property determines the maximum file size that can be uploaded. The
executionTimeout property determines the maximum time for execution.

If it works in your local machine and does not work after deployment in IIS (i used Windows Server 2008 R2) i have a solution.
Open IIS (inetmgr)
Go to your website
At right hand side go to Content (Request Filtering)
Go to Edit Feature Settings
Change maximum content size as (Bytes you required)
This will work.
You can also take help from following thread
http://www.iis.net/configreference/system.webserver/security/requestfiltering/requestlimits