Django File Upload with more than 6 MB thru admin - this website is not available

Question

I am trying to upload a file thru admin page, the size of the file is over 6 MB, once i try to upload, i am getting: This website is not available. I opened in FF and saw this error message in browser:

The connection to the server was reset while the page was loading

I tried to change the file upload max size in http.conf in this way:

<Directory "/usr/local/httpd/mypage/path/to/media/uploadfolder">
     LimitRequestBody 104857600
</Directory>

I am in virtualhost server.

this change didnot succeed, what should i do now?