It doesn't sound like a 'feature'; you should get in touch with Astaro or see if they respond here. I could have you dump out info from command line to debug it, but they would probably know what it is quicker than we could do that. But if you're a gearhead, repost and someone here will talk you through it
(we would next look at what's inside your http proxy settings file)
i have no Network called 'Internal_network__' or 'Internal (Network)'. Is this a standard one or may the name be diffenrent? I have certainly have a internal network but not with that name.