I'm running DotNetNuke_04.08.04 and I've added the File Repository Module however when I try to upload a file, it gives me an error:

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

    *   The site could be temporarily unavailable or too busy. Try again in a few
          moments.
    *   If you are unable to load any pages, check your computer's network
          connection.
    *   If your computer or network is protected by a firewall or proxy, make sure
          that Firefox is permitted to access the Web.

It also gives me an error in Internet Explorer too.

I also changed the skin back to a default DNN skin to see if that was the problem, it didn't resolve the issue.

Did I misconfigure something or am I doing something wrong?

Hmm, the file is over 25 mb, so maybe I have to change the web.config.. ill try it out.

Thanks all.  That was the problem.  I just figured if it was too big or something, I would have gotten a notification of some sort instead of confusing page could not be displayed type thing :)