Uploading a file via http does not work, but on https it works fine

I have the following script loading a sever file form:

• I am trying to download many files from the server via HTTP (but not SSL) on an ASP.NET page, but one of the files does not load; it returns an error: operation timeout.

• When I try to download this file via HTTPS, it works well.

• I tried to download the file using other software using simple HTTP, and I got the same error message.

I am very grateful for any guidance or help.