> No matter what values I enter in "Number of
> connections" and "Max connections / seconds" fields
> WinHttrack apparently always works with no more than
> 2 simultaneous connections.

Only two ? The soft limit is 4 connections / seconds normally.  Is this
behaviour reproductible with all downloads ?
See also: 
<http://forum.httrack.com/readmsg/13774/index.html?pid=13768&days=10000&js=1&lang=en>