I've just started working with SB and have 20 private poxies, but only 5 or so work, the rest come back as "Error 407 Proxy Authentication Failed" Proxies they are from yourprivateproxy and work perfectly when I put the entire connection through an Amazon VPN. My IP has been added for both connection at yourprivateproxy. What is it about my regular connection that would cause this? Are there some ports or settings or something that need changing? I'm in Thailand with True internet ISP. How can I get around this?