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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>

413 error on web application even with needed properties in web.config

I have a web application API which is published with IIS.
Clients upload files on my app (via PostMan) which I later process. It has been working fine. Now they tried to upload a large file of 70MB and they get 413 error.
I tried changing parts of web.config:
<system.webServer>
<serverRuntime uploadReadAheadSize="100000" />
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="30000000" />
</requestFiltering>
</security>
</system.webServer>
But I still get the same error. What am I missing?

I also had the same problem a while ago.
The fix is simply to up the size of the UploadReadAheadSize Metabase property.
IIS- uses a new Metabase property called UploadReadAheadSize when passing data to an ISAPI extension.
How To:
The following command instructs you to get the size as follows:
.cscript adsutil.vbs set w3svc/1/uploadreadaheadsize 204800

Response string cut to 2033 characters

I created an application in C# (ASP.NET MVC) and it works very well in Visual Studio, but when I install it in IIS, the calls to ajax only return 2033 characters.
I already put this in web.config (but it does not work):
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="500000000" />
</requestFiltering>
</security>
<system.web>
<httpRuntime maxRequestLength="500000000" executionTimeout="120" />
</system.web>
Can someone help me please?

What version of IIS you are using? I suspect it is below 8, probably 7 or 7.5 then this issue is known and related to IIS.
Better use upgraded version.

issue related to Max File size of Fileupload control

I have deployed my Website on Windows Server 2007. in IIS
I have added asp:FileUpload control
i have set <httpRuntime maxRequestLength="60000"/> under the <system.web> in my Web.Config file
but website doesn't allowed to Save the the file of maxlength as specified in web.config file.
how can i do this?
Thanks..

I think you need to use the following in the web.config file.
<configuration>
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="60000" />
</requestFiltering>
</security>
</system.webServer>
</configuration>

In addition to #Maarten answer which is right.
The problem is IIS 7 or greater have default allowed value of maxAllowedContentLength is 30000000 Byte, So if you try to upload a file greater then this limits it will display Request filtering module is configured to deny a request that exceeds the request content length Issue error.
For a demo of this error which this link

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.