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Large file uploads stop immediately, 404 error

I am having a weird problem with uploading large files in the Drupal admin’s file field. I have the size limit set to 500 MB. I also have the php.ini settings for upload size, post size, and memory all set to 500 MB.

When I upload a smaller file like 50 MB everything works perfectly. If I upload a larger file such as 250 MB then the upload fails immediately and I get a 404 error in the Network tab of the Chrome inspector.

The 404 error is on this URL: http://example.com/file/ajax/field_video_file/und/0/form-tpohUDjq_v0b7OcNhtnQl2TaRc5UcFl9zwJQzI3mlwE

The server is running IIS 7.5.

Any ideas what could be causing this?

Thanks!

This article was republished from its original source.
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Large file uploads stop immediately, 404 error

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