Maximum request length exceeded.

Question

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?

score 2178 · Accepted Answer · edited Jun 02 '20 at 15:22

2178

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.)

edited Jun 02 '20 at 15:22

SharpC

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answered Oct 04 '10 at 08:52

Sachin Shanbhag

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Thank you sachin and i added some thing like – Surya sasidhar Oct 04 '10 at 09:04
@Surya- The length is in kbytes. So you can set any size as you want in MaxRequestLength. My example sets the size to 1gb, yours is 32MB – Sachin Shanbhag Oct 04 '10 at 09:07
42

With both IIS 7.5 and VS RC 2012 IIS Express I had to set BOTH of these. The httpRuntime one configures ASP.NET's max length while requestLimits configures IIS's max length, http://stackoverflow.com/questions/6327452/which-gets-priority-maxrequestlength-or-maxallowedcontentlength and http://forums.iis.net/t/1169846.aspx – Despertar Aug 06 '12 at 08:21
14

Make sure that you're adding this setting to the main `Web.config` instead of the one inside the `Views` folder – Serj Sagan Mar 04 '13 at 15:29
i have iis 8, i did what you said, but still not exceeded, any solution for iis 8 ? – Tarek Jul 26 '13 at 13:13
@AmbiguousTk - As far as I know, it should be same settings for IIS8 too. what is the limit you are trying to set? Seems the max upload limit you can set is upto 2GB. – Sachin Shanbhag Jul 26 '13 at 14:17
@SachinShanbhag i set it to 1000000000 byte which means 953 mb, and i restarted the web site, yet the error is showing up... – Tarek Jul 26 '13 at 14:22
3

@SachinShanbhag Please include `IMPORTANT: Both of these values must match. In this case, my max upload is 1024 megabytes.` **from Karls answer** to make this right, then it works. – Don Thomas Boyle Sep 03 '13 at 15:40
3

Your calculations are in Kibibytes and Gibibyte, time to update the answer? Hehe. – Rosdi Kasim Apr 08 '15 at 21:07
@SachinShanbhag any idea how to implement this on java? http://stackoverflow.com/questions/31914474/system-web-httpexception-maximum-request-length-exceeded – Ondrej Tokar Aug 10 '15 at 11:37
Be careful that in your web config file this node may be already have so you just add additional attribute only then.Just copy and past wont work since it already define the attribute then trow a error. – Prageeth godage Jan 08 '16 at 04:43
I have multiple Web.config files in my project - do they all need these entries? – B. Clay Shannon-B. Crow Raven Feb 04 '16 at 21:14
1

@B.ClayShannon add it to the root web.config file. – yogihosting May 04 '16 at 11:25
@tarek try adding executionTimeout="3600" to httpRuntime and see if this solves your problem. – yogihosting May 04 '16 at 11:26
Shoud I increase uploadReadAheadSize as well? – mtkachenko May 04 '16 at 15:36
In my case the Root web.config file was located under \Windows\Microsoft.NET\Framework\v4.0.30319\Config\ – 0014 Oct 12 '16 at 15:56
When I do this I receive an error saying my config file couldn't be read. HTTP Error 500.19 sites the line I add as being the source of the error. Is there something else I need to do? – Brad Apr 06 '17 at 19:39
Does this apply to Azure App Service? – hiFI Sep 24 '20 at 04:57

score 596 · Answer 2 · edited Oct 18 '14 at 20:32

596

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.

edited Oct 18 '14 at 20:32

Amirhossein Mehrvarzi

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answered Sep 19 '12 at 13:45

Karl

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To any it may concern: This answer also works perfectly for IIS-Express (asp.net-webpages with WebMatrix) – VoidKing Mar 01 '13 at 21:36
5

Yes, this is answer that worked for me instead of Sachin's answer. It works on Azure too. – Gautam Jain Mar 21 '13 at 10:00
5

This is definitely the correct answer... both entries must be present. In case of MVC 3, it can be in the project root `web.config` file. – Miguel Angelo Jun 03 '13 at 22:05
2

another important thing is the 'executionTimeout' which Karl mentions – Muhammad Amin Aug 20 '13 at 14:22
29

I had to combine this with an existing line for: – Ken Mc Nov 20 '13 at 00:53
2

To all the people who are new to ASP.NET there is a web.config file and a web.Debug.config file. The edits need to go into the Web.Config file, not the web.Debug.config file. – Darren Hoehna Apr 15 '14 at 15:29
This cause error in iis express 10 and targetFramework="4.5.2" But when combine with Works correctly – ramin_rp Aug 23 '15 at 09:14
I have multiple Web.config files in my project - do they all need to have these entries added? – B. Clay Shannon-B. Crow Raven Feb 04 '16 at 21:13
1

I guess with with more the upload size, the timeout should be adjusted so that the request doesn't terminate when the upload is in progress. – Soundararajan Mar 01 '16 at 06:40
@B.ClayShannon add this in the root web.config file. – yogihosting May 04 '16 at 11:00
1

executionTimeout="3600" is that means 1 hour? – toha Jul 20 '16 at 04:23
Thank you. setting both values and matching both is very important. – D.L.MAN Apr 13 '21 at 20:05
I don't get it: 10 Bytes is 1 KB. How do the values in this answer correspond? – Tillito Nov 12 '21 at 11:25

Nick Albrecht · Answer 3 · 2013-05-13T15:30:59.060

218

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>

edited May 13 '13 at 15:30

answered May 06 '13 at 16:57

Nick Albrecht

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Nice Solution thinking about the location. But is there a location path when working with MVC (and therefore working with routes)? – Luuk Krijnen Aug 06 '14 at 14:02
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It would be a URL corresponding to the route that you have your upload action set to. In my case, I have a Documents controller with an action called Upload that I post the form to. In your case it would be whatever the url to your action would be. – Nick Albrecht Aug 06 '14 at 16:17
For anyone who likes this answer, [see this](http://weblogs.asp.net/jongalloway/large-file-uploads-in-asp-net). – DontVoteMeDown Jan 07 '15 at 11:44
I have not tested it with WebAPI but I have no reason to think it wouldn't work with it – Nick Albrecht Aug 10 '16 at 18:22
2

Dude you rock. Sorry, but my tiny little up vote wasn't enough. – Nicholas Petersen Oct 29 '17 at 05:24
Worked for me with WebAPI, This is the best answer by far – m12lrpv Sep 03 '18 at 23:10
1

This will work with WebAPI for up to and including MVC v5. Once you hit ASP.NET Core with MVC Core, then there are different options you should set for Kestrel. – Nick Albrecht Sep 05 '18 at 01:03
What is the parent node for `location`? – Sinjai Oct 30 '18 at 21:30
In my example above, the parent node is the domain. So it might be `http://www.example.com/Documents/Upload` – Nick Albrecht Oct 31 '18 at 17:21
Thanks for your help. I have the same values in my config, but still getting the error: ` ` – Ivan Doroshenko Feb 03 '20 at 04:48

score 54 · Answer 4 · edited Apr 21 '20 at 09:14

54

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)

edited Apr 21 '20 at 09:14

Community

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answered May 23 '15 at 19:58

Serge Shultz

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maxAllowedContentLength should be higher than (maxRequestLength * 1024) for the exception generation. – Der_Meister Jan 19 '16 at 04:50
1

This post gave me what I needed to warn the user but `HttpContext.Current.ClearError()` was needed to allow the `Response.Redirect()` to work properly. In terms of `web.config` it works just with the `maxRequestLength` attribute of `httpRuntime`. – nrod Nov 28 '18 at 17:12
File size validation and user-friendly message can be done via JS at the page level using an `onchange` event on the upload button and comparing the upload file size with the max upload limit. – Alfred Wallace Mar 28 '19 at 03:22
this doesn't seem to get thrown if the request is bigger than `maxAllowedContentLength`. In that case, IIS appears to respond before as ASP is invoked. So need to set this very large – Garr Godfrey Mar 05 '21 at 01:21

score 32 · Answer 5 · edited Apr 16 '20 at 08:18

32

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

This is explained here.

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

edited Apr 16 '20 at 08:18

Arsen Khachaturyan

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answered Oct 04 '10 at 08:51

Dave

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The link is redirecting me to the microsoft support homepage – Bishop Oct 13 '15 at 16:17
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Maybe something was wrong. The link redirects [here](https://support.microsoft.com/en-us/kb/295626) – gofr1 Jul 07 '16 at 05:18

Sergey Tarasov · Answer 6 · 2019-01-22T02:31:13.277

26

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

edited Jan 22 '19 at 02:31

answered Aug 10 '17 at 07:13

Sergey Tarasov

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AWESOME, so how does the top answer have > 1600 votes, and this only 5? This is terrific, because so often, it's just a single action we want this on. Further, no messing with other settings, etc. – Nicholas Petersen Jun 01 '18 at 16:39
This is what I was looking for. – Chris Catignani Jul 05 '18 at 18:02
@Nicholas Petersen as the help file describes, you cannot use this method from an .aspx page, and this is why – Ehsan Abidi Jul 27 '22 at 12:15

score 20 · Answer 7 · edited Jan 23 '12 at 18:02

20

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

<httpRuntime 
    maxRequestLength="1048576"
  />

edited Jan 23 '12 at 18:02

bkaid

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answered Oct 04 '10 at 08:52

ema

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score 19 · Answer 8 · answered Mar 21 '18 at 17:46

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

score 10 · Answer 9 · edited Nov 02 '18 at 13:56

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>

score 6 · Answer 10 · answered Dec 31 '15 at 03:13

6

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.

answered Dec 31 '15 at 03:13

NiaoBlush

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score 5 · Answer 11 · answered Oct 19 '15 at 23:15

5

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.

answered Oct 19 '15 at 23:15

mhenry1384

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If I could upvote this more than once I would. This wasted a day of my life. If you have a virtual dir sub-application, you have to put the `httpRuntime maxRequestLength="###` and `requestLimits maxAllowedContentLength` in a web config at the root level, not at the sub-app level. – nickvans Feb 08 '17 at 14:03

score 1 · Answer 12 · answered Apr 18 '16 at 14:52

1

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.

answered Apr 18 '16 at 14:52

Graham Laight

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score 1 · Answer 13 · answered Jan 30 '17 at 00:48

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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

answered Jan 30 '17 at 00:48

HyperActive

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web.config from your own project should override these, so I don't see the need to modify `applicationHost.config`. – bvgheluwe Nov 27 '19 at 10:40

score 1 · Answer 14 · answered Nov 23 '20 at 17:16

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>

score 0 · Answer 15 · answered Mar 11 '23 at 07:54

0

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.

answered Mar 11 '23 at 07:54

Soundar Rajan

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score -3 · Answer 16 · edited Jan 20 '16 at 13:56

-3

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>

edited Jan 20 '16 at 13:56

Paul Roub

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answered Jan 20 '16 at 13:52

Cesar Miguel

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The `executionTimeout` attribute has nothing to do with what is asked, and neither does the `compilation` tag. – Mathias Lykkegaard Lorenzen Aug 09 '16 at 14:24

Maximum request length exceeded.

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