I'm mirroring a site and some gif images are randomly generating the error:
"engine: warning: entry cleaned up, but no trace on heap:".

When I look at the downloaded file for the image all it contains is the
following message: "illegal range request or no data: bytes=645-" where the
number of bytes is the size of the image.

The images download without a problem when viewed through a normal web
browser.

Can anyone tell me if this message is a HTTrack error or if it is being
generated the webserver?
Thanks