Internet account all of a sudden need to enter your password?

I have students and teachers live outside the 3 Jiashu Lou computer with the 4-hole router is the fastest campus network to download 4M / S has been a good afternoon, one day I would one Internet site no matter what point will be a Bengchu IE interface, “Welcome to this Broadband access system “to enter the account password and then we did not use to pay a monthly private account password, but after about 4 hours automatically, but it appeared today on this issue and has been around for VISTA show no sign of any computer connected well with the routing path And the network connection is a red cross Please help us to solve

may be the school system to upgrade the Internet, or broadband access system , Then you are a school, as long as the server to connect schools to pop up automatically.1.Duplication line network, after all, live in Jiashu Lou staff, even the education network, but if other people next door home broadband equipment, it may Upstairs is the issue of line, weaved a
2.Broadband is likely to re-enter the school, I University when students do not have to have the network of schools, Zhuangkuan Dai himself, but also very cheap at that time