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Editorial Team
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Asked: 2026-05-11T20:09:13+00:00

I have configured the web.config to allow 50 MB <httpRuntime maxRequestLength=51200 /> but when

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I have configured the web.config to allow 50 MB <httpRuntime maxRequestLength="51200" />
but when I try to add an Atachment of 40MB to a sharepoint list it fails.
But it works if I increase the maxRequestLength to 52 MB <httpRuntime maxRequestLength="53248" />.
What is happening?? does the web service call increse the size of the request? is there a way I can fix this, so if I configure the maxRequestLength to 50 MB it allows the 50 MB ?

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1 Answer

  1. Editorial Team

    A file that is uploaded via WSS 3.0 Web Services is actually put in the XML message itself. In order for that to happen it becomes Base64 encoded. This will then increase the file size by 33% due to the nature of that process. You will have to make sure to allow for 33% more than your largest files in the web.config setting you referred to.

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