it happened with me as well as him and my Internet in the bottom right is full so I don't think it is my Internet all the other computers are just fine around my house so i've tried turning off my firewall as well so its not firewall I don't really know what to do for this unknown problem. Oh and it works on vanilla mine craft and borderlands 2 and etc. its really pissing me off because all my friends want to do a series and my tekkit dosent work after the update! :L