Hello fellow blackhatters, I have a few questions. This may seem silly, but do not ask are more stupid for me. I want to use ScrapeBox for link building. I read that comment posters should not be done using public proxies. I am Newbie at this. I bought proxies from yourprivateproxy.com, and when I test the proxies then I found this error message: 'Error 407 Proxy Authentication required' Help from you all would be greatly appreciated. I need this, advice from experts will be very helpful.