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HTTP Downloads - Frequently Asked Questions

  1. When using the HTTP transfer protocol why does my download seem to stop at the same place each time?
  2. When using the HTTP transfer protocol what happens if my network connection is dropped before the download completes?
  3. When using the HTTP transfer protocol why am I having problems using download utilities?
  4. Why do I have trouble downloading large files?


When using the HTTP transfer protocol why does my download seem to stop at the same place each time?

Your proxy/firewall may have a timeout setting or you may only be allowed to download a certain number of bytes through your proxy/firewall.  Contact your system administrator to increase the setting.



When using the HTTP transfer protocol what happens if my network connection is dropped before the download completes?

In order to resume interrupted downloads, your Web client, your Web proxy server (if used) and our server must all support "byte-range serving".  Our servers support this, you can use any download utility to resume interrupted downloads.  Some browsers are also able to resume interrupted downloads.  A few poplar download utilities can be found here:



When using the HTTP transfer protocol why am I having problems using download utilities?

The URLs used to access our site are only valid for a number of hours.  An attempt to download a file after the URL has expired will result in a redirection back to the registration facility you entered through.  The download utility will consider this a failure and continue to retry.  In order to resume an interrupted download with an expired URL you must first use your Web browser to navigate through the registration facility back to the desired download.  Then the download utility will be able to resume the transfer.  Also, some organizations utilize a cache server in conjunction with proxy / socks.  If your download utility is making a "byte-range call" for part of a file, the cache server may ignore this because it thinks it needs to cache the entire file. Your download utility would appear to hang until the cache server get the portion of the file you requested.



Why do I have trouble downloading large files?

First, there are no file size limits when downloading using Download Director. However, HTTP-based downloads using Internet Explorer do have limitations for large files. Files larger than 4GB are not supported by IE, and files between 2GB and 4GB may not complete (for details see http://support.microsoft.com/kb/298618).

If you encounter these IE limitations, we suggest you either use Download Director, or try another browser (e.g. Mozilla Firefox) that does not have these limitations.