>> I have used HTTrack successfully earlier, 
>> but it doesn't seem to work, not with any sites at all.
>> So the warning about the cache probaly is not very
>> meaningfull. But also the "Connect error" does not 
>> give any hint how to resolve this problem.

> It looks like you're trying to access an intranet so my
> first suggestion would be to look at proxy settings.  
> You may have to add a proxy, or actually remove
> the setting so HTTrack reaches the server internally 
> on the network.

Spot on. That's what I also had to do to solve a similar
problem. But it took me considerably longer to identify it. 
It can seem mysterious when it happens all of
a sudden. HTTrack has such an intuitive logic that,
whenever I have to spend time wrestling with such problems,
I now think "options and settings". Oh, and it might also
help if in your <Build> you "Don't purge old files".