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HttpException: maximum request length exceeded, even when config has values that should allow it

I can't seem to allow a 4.3MB upload. I keep getting this error:
System.Web.HttpException (0x80004005): Maximum request length
exceeded.
My web.config settings in my Web API:
<!-- maxRequestLength expresses POST buffer size in KB. This is the ASP.NET limit. -->
<httpRuntime targetFramework="4.5" maxRequestLength="20000" />
<!-- Let this be larger than maxRequestLength so we get ASP.NET error (if request too large) instead of IIS error. -->
<requestLimits maxAllowedContentLength="20480000" />
And this is the call to the API from my web project:
var response = await httpClient.SendAsync(proxyRequest);
That always returns the above error. What am I missing? I did read where maxRequestLength needs to be the same value as maxAllowedContentLength, but that didn't work either.

The "Default Web Site" in IIS had a config file with almost nothing in it. I added maxRequestLength="20000" to it and it worked. My app is one of many apps under "Default Web Site."
Added this:
<system.web>
<httpRuntime targetFramework="4.5" maxRequestLength="20000" />
</system.web>

Is there an upload limit when using Web Client in C#?

Using UploadFile("upload.php", "POST", filePath) with WebClient anything over 4mb will not upload. The limit in PHP is set at 48mb. Is there I need to set in C# ?

There is a default maxRequestLength set at 4MB in ASP.NET, you can change it in the web.config.
<configuration>
<system.web>
<!-- This will handle requests up to 1024MB (1GB) -->
<httpRuntime maxRequestLength="1048576" timeout="3600" />
</system.web>
</configuration>
The length is specified in KB in the config file. If you are using IIS there is an additional limit set at 4MB by IIS.

I have solved the problem. By changing the following in the php.ini
post_max_size = 40M
I had already changed the upload_max_filesize but was not aware of this other param which needed changing.

Maximum request length exceeded error in file uploading

How to upload the 5mb pdf files using html upload button?when I try upload the 5mb files I get Maximum request length exceeded error?.This problem occurs because the default value for the maxRequestLength parameter in the section of the Machine.config file is 4096 (4 megabytes).So I try to change webconfig file,
<configuration>
<system.web>
<httpRuntime maxRequestLength="102400" executionTimeout="1200" />
</system.web>
</configuration>
If i use like this i got the An existing connection was forcibly closed by the remote host error.my project is hosted with IIS7.So I try to,
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="1048576" />
</requestFiltering>
</security>
</system.webServer>
This way also not allow to upload the 5mb files?How to upload the 5 mb files through HTML Upload button?

trying adding a "0" To the end of your <requestLimits maxAllowedContentLength> value. I think it's in bytes, which means your example sets it to about 1MB.
Here's the doc on this setting.

If you are running this on a shared hosting account, chances are less that you will be able to resolve this. Due to limited resource allocation, hosting providers specify the timeout for a connection so if the connection takes too much time, it closes it.
My advice is, you should seek help of your hosting provider or try changing the host or plan.

Assuming this is your own server, if not see Murtuza Kabul.
Try
requestLengthDiskThreshold="800000"
Btw I would recommend NeatUpload because the HTML Upload isn't very good in my opinion.

Uploading file size over 4 MB in .NET

I am having trouble uploading a file size over 4 MB. I've tried adding
<httpRuntime maxRequestLength="102400" executionTimeout="99999" />
to my Web.Config like many posts have suggested, but it just isn't working. Files under 4 MB work just fine, so I'm nearly certain I'm running into the 4 MB limit. Are there any settings in IIS that I might need to change?

You need to update the value of maxrequestlength in the web.config:
Maximum value of maxRequestLength?
Max Request Length

You can use that code into your web.config file.
<system.web>
<httpRuntime executionTimeout="3600" maxRequestLength="102400000000"
appRequestQueueLimit="100000" requestValidationMode="4.0"
requestLengthDiskThreshold="10024000000000"/>
</system.web>
I think it will work

Try to use File.SAVEAS but get 404 error, because the size is big

I'm using asp:fileupload control to upload my Picture files. So the user click on browse and select the file and click on upload and in event handler of upload button there is FileUpload.PostedFile.SaveAs () etc.
Everything works fine. Accept when for big file size. e.g. I've got a file (jpg) 5.5 MB. When I try to upload this file I get an the error below.
The strange thing is I the button upload file eventhandler I check the file size. If (intFileesize < intFileSizeLimit) etc.
But the strange thig is I remove all the code in Upload eventhandler for testing/debugging and I still get the error below. So the error occurs outside the Button handler. I mean
the error cause is not by Fileupload.SAveAs etc.... So the question is how can I avoid this. I mean I have built restriction of 1 mb, but This code is not reached.
I don't have any problems with small sizes e.g. I could upload 400 kb w/o problem.
So the question is what is the cause for the big file size how can I solve this?
Other question is: Is there a tool or whatever to crop the filesize and upload? I mean even if they upload 6 mb picture, I should crop that to 50kb or whatever during upload. How to aproach this? maybe a 3rd party freeware?
ERROR I get after 2-3 seconds
Oops! This page appears broken. HTTP 404 - File not found.

see maxRequestLength in http://msdn.microsoft.com/en-us/library/e1f13641.aspx

The default request size is likely being reached. By default I believe ASP.NET supports a 4MB request size limit. You can change this in your config:
<system.web>
<httpRuntime executionTimeout="240" maxRequestLength="20480" />
</system.web>
The above example changes the request size to 20MB. The thing to take into consideration is that HTTP was never really designed to handle large file uploads. You may want to consider using an alternative, such as a Flash upload control...
UPDATE
For IIS7 you may need to update the configuration in the system.webServer section:
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="20480" />
IIS uses the same configuration system as ASP.NET, but because it may not be an ASP.NET handler being called, it has an additional setting for other content requests.

Since you already have maxRequestLength set in the <httpRuntime> tag in web.config, it looks like you are hitting the IIS7 request filter.
Try adding this to your web.config:
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="33554432"/>
</requestFiltering>
</security>
Depending on how your server is set up, you may also need to change the IIS configuration to allow you to set up request filtering at the application level rather than the machine level. Edit %windir%\system32\inetsrv\config\applicationHost.config and change:
<section name="requestFiltering" overrideModeDefault="Deny" />
To:
<section name="requestFiltering" overrideModeDefault="Allow" />