I get the following error when i upload a mp4 file with the size 50mb a mp4 file of 2-3mb works.

i have configurated the extension for mp4 and changed the httpRuntime to allow: maxRequestLength="524288" executionTimeout="3600" when i use fiddler to look on whats happening for when it works and when it fails here is what i have so far:

When it works the request is sent with application/json but when it fails the request is text/html.. xD

so i was wondering if anyone know how to fix this?