HTTP 413 Request Entity too Large - Can't upload large files

HTTP 413 Request Entity too Large - Can't upload large files

If you are tring to upload a file using file uploader in IIS6 ro IIS7 normally HTTP request is allowed to upload upto file size 2 MB. But when you are using file upload feature with CAC (client access certificates) the SSL preload is used a new metabase property called UploadReadAheadSize in IIS6 or 7 to determine the maximum buffer size of the incoming request. The default size for this buffer is 48k, which was added to prevent anonymous DOS attacks by uploading very large garbage files.

Simply you can increse this thresold value to avoid this problem. You can change this setting up to 4GB although you probably wouldn't want to do so unless you had a compelling business need. Of course a site that required authentication would be an effective way of limiting the chances of DoS, so if you do need to up this limit, you should consider requiring client authentication to connect.

Use following scripts to change the uploadreadheadsize:

cscript adsutil.vbs set w3svc/1/uploadreadaheadsize 204800

If you get following error, you need to install adsutil.vbs script in your machine. or you can run this command from the location of the script.

Microsoft Windows [Version 6.0.6001]Copyright (c) 2006 Microsoft Corporation. All rights reserved.
C:\Users\Administrator>cscript adsutil.vbs set w3svc/1/uploadreadaheadsize 204800Microsoft (R) Windows Script Host Version 5.7Copyright (C) Microsoft Corporation. All rights reserved.
Input Error: Can not find script file "C:\Users\Administrator\adsutil.vbs".

Search "adsutil.vbs download" to get the lates script from the web.

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