HttpException: Maximum request length exceeded

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Dec 30 2006

.NET

I have come across this error multiple times at work. This problem occurs because the default value for the maxRequestLength parameter in the section of the Machine.config or Web.Config file is 4096 (4 megabytes). As a result, files that are larger than this value are not uploaded by default.

To resolve this problem, use one of the following methods:

In the Machine.config file, change the maxRequestLength attribute of the <httpRuntime> configuration section to a larger value. This change affects the whole computer.

In the Web.config file, override the value of maxRequestLength for the application. For example, the following entry in Web.config allows files that are less than or equal to 1 GB to be uploaded:
<httpRuntime maxRequestLength="1048576" />

Max value for maxRequestLength attribute is "1048576" (1 GB) for .NET Framework 1.0 or 1.1 and "2097151" (2 GB) for .NET Framework 2.0.

Note: During the upload process of large files, built-in ASP.NET loads the whole file in memory before the user can save the file to the disk. Therefore, the process may recycle because of the memoryLimit attribute of the processModel tag in the Machine.config file. More info you can find in Microsoft KB article: http://support.microsoft.com/default.aspx?scid=kb;EN-US;295626

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Comments

5/3/2007 7:21:42 PM #

Excellent article...... solved my upload problem immediately.
Thank you.

Vaughan Chetwynd

5/10/2007 1:09:43 PM #

lol

5/31/2008 5:45:56 AM #

My problem is Maximum request length exceeded. It is solved immediately. Thanks.

Shahaji Nangare (Senior System Analyst)

7/7/2008 6:39:24 AM #

Thanks a lot.....

Isaac Zothanpuia

9/8/2008 9:33:00 AM #

Really it's very helpfull articile

Thiyagu

10/27/2008 9:30:09 AM #

Thank you! This solved my problem immediately!

thanks

11/24/2008 11:42:58 AM #

I was getting this error when attempting to display and handle a large amount of data on the page. Simply changing the maxRequestLength did not fix the problem, but rather modifying the other attributes of httpRuntime in conjunction with maxRequestLength corrected the issue.

maxRequestLength="2097151"
executionTimeout="12000"
useFullyQualifiedRedirectUrl="false"
minFreeThreads="8"
minLocalRequestFreeThreads="4"
appRequestQueueLimit="100"
/>

Reference: msdn.microsoft.com/en-us/library/e1f13641.aspx

Mark

3/12/2009 12:54:17 AM #