By default, IIS7 limits file upload to 30MB. Oddly, it returns a 404 error if someone uploads something larger than 30MB. The docs from Microsoft are a little confusing on this, so I thought I would try to clarify.
According to the following article, you can "Remove the maxAllowedContentLength property." from the applicationhost.config file in IIS7 to lift the 30MB limit. However, in my case, this property was never in the file to begin with.
http://support.microsoft.com/kb/942074/
So, my assumption on this is that the 30MB limit is somewhere internal to IIS7. The article also doesn't say where to ADD the entry requestLimits node if it isn't already there.
Luckily, there is an alternate solution that can be enabled at the site level rather than server-wide.
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="524288000"/>
</requestFiltering>
</security>
</system.webServer>
If you add the above code to the web.config file for your site, you can control the maximum upload size for your site. In many cases, the system.webServer node will already be in the file, so just add the security node within that.
Note that the maxAllowedContentLength is in BYTES not kilobytes.
You may also need to restart your Web site (not the whole server) to enable the setting.
In case you are curious, why would I want people to upload files larger than 30MB? We were working on a video conversion script that allows people to upload large MOV files and converts them to FLV.
May 24, 2010 at 3:02 AM A simle solution....
Open IIS 7 SnapIn
Select the website you want enable to accept large file uploads.
In the main window double click 'Request filtering'
once the window is opened you may see on top a list of tabs eg: file name extensions, rules, hidden segments and so on...
regardless the tab you select, in the main window rightclick and select "Edit Feature Settings" and modify the "Maximum allowed content length (bytes)"
Now you can upload files larger than 30 MB ....
Jun 6, 2011 at 7:33 AM Great solution to IIS7 File Upload size limits.
Jul 26, 2011 at 1:30 PM very thanks....
Aug 10, 2011 at 5:53 PM many helpings...
Oct 20, 2011 at 9:26 AM Thanks a million!
Was battling with this configuration for the Coporate Content Management System.
Oct 26, 2011 at 6:24 PM thanks.
With this solution,...
I'm uploading larger file (150 Mb), what happend with the time for uploading larger files, it´s too longer..
can i to reduce this time?
Thanks
Nov 8, 2011 at 5:32 PM it works..thanks buddy
Jan 24, 2012 at 12:18 PM Any chance to upload a file over 2Gb in one piece? I need to upload files of at least 10Gb, otherwise IIS is not an option for me. As far as I understand 2Gb is the IIS and ASP.NET limitation, is it fixed in IIS 8 / ASP.NET 4.5?
Jan 24, 2012 at 1:51 PM @WebDAV - To my knowledge it is not possible to do this with IIS 7.5. It has a 2GB max limit. There is also something else working against you. Most browsers limit you to a 2GB upload size anyhow. So, even if IIS would let it through, you might not be able to upload anyhow.
More info here: http://www.motobit.com/help/scptutl/pa98.htm
Feb 13, 2012 at 11:06 AM This fixed an upload problem for me. Thanks!
Feb 13, 2012 at 3:15 PM @Mike Sprague - most browsers support uploads over 2Gb already. Try Google Chrome for example.
Feb 14, 2012 at 10:16 AM Thanks
Feb 27, 2012 at 5:27 AM Merci bien
The web config solution made my day
Feb 29, 2012 at 6:06 AM Thanks much...
It really helped...
Cheers
VJ
Mar 3, 2012 at 2:56 PM For some reason the solution above does not help for files over 2GB. We are setting a value to max which is 3.99GB and is <requestLimits maxAllowedContentLength="4294967295"/>
Any idea what else should we try?
Mar 3, 2012 at 3:11 PM @Vlad - What browser are your users using? Not all browsers support over 2GB upload. It's a little outdated, but there is a chart on this page: http://www.motobit.com/help/ScptUtl/pa33.htm
Mar 3, 2012 at 3:16 PM Mike, says, I tried every browser: chrome, ie, mozilla!!! It goes for awhile and then boom, it stops.
Mar 3, 2012 at 3:53 PM ASP.NET 4.0 does not support uploads over 2Gb. According to this post it is increased in ASP.NET 4.5: http://aspnet.uservoice.com/forums/41199-general/suggestions/2642879-maximum-upload-size-in-asp-net-is-2gb-increase-it?tracking_code=5805b1d13655be23d0395513447ba9f7
Chrome supports uploads over 2Gb, I have tested it.
Nov 27, 2012 at 1:20 AM Interesting. Thanks for sharing and providing a practical example.
Jan 9, 2013 at 11:21 AM Also see the following:
http://www.webdavsystem.com/server/documentation/large_files_iis_asp_net
-ASB: http://XeeMe.com/AndrewBaker
Feb 21, 2013 at 11:25 AM I spent all day looking for a solution until I read this article. You explained it very well so thank you
Mar 5, 2013 at 8:43 PM I got the result without any problem on IIS 8. Thank you.
Mar 19, 2013 at 7:14 AM This is a good article. I am running mojoportal lates edition in mendiumtrust web config. I still don't get the result on live server. Only capable for uploading image file under 40kb only. I also have set the time out limit to 3600. Everything works well on local. Is there anymore settings to be set for this purpose??? Any help would be appreciated. Thanks.
Apr 10, 2013 at 2:11 PM Work for me.
thks.
Apr 25, 2013 at 10:58 AM Uploading my files the iis 7.5, my iis 7 freeze while loading file any idea?
May 17, 2013 at 7:47 PM I am also having the same issue as Bedd.
Bedd: Any luck with you?
thanks.
May 18, 2013 at 11:08 AM Thx a lot solution from AgoMago date post May 24, 2010 at 3:02 AM. For me and my AjaxExplorer works fine. Again thx.