> I've just installed webhttrack 3.47.13-1 from debian
> source on my sid, but I can't do nothing with. I got
> this error in title (can't access to step 2 because
> this).
> What can I do, all search  I made don't help me
> (topics too old or not very helpful).

If you replace <http://debian:8080> by <http://localhost:8080>, does it helps ?
Your local machine hostname might be incorrect