> Trying to download a website using HTTrack 3.02, it 
> used to work well.  But when I try it again 
recently, 
> it trying to connect 1.asp (main page) and robots.txt
> Then it prompts saying the mirror is empty ...
> Is it because the webmaster has created something to 
> prevent HTTrack from working?
Might be. The default browser identity allows to do 
such things, and the robots.txt rules can, too.
You can disable both of them, but please read the 
abuse faq first 
(http://www.httrack.com/HelpHtml/abuse.html) and 
especially, try to set reasonnable limits to n# os 
connection when downloading!