I've sent you an email with the logfile httrack.txt 
attached, which contain the error above; Also in the same 
log, it has errors like 

"Warning: 	Unexpected 412/416 error (Requested Range 
Not Satisfiable)"

Error: 	"No data (connection closed)" (-4) after 2 retries 
at link ....

Error:  "Unknown (not HTTP/xx) response structure?
All above errors seldom occur in other website.

Many thanks!