Question: can't access

From yesterday, I can’t access using my Chrome or Firefox, from different desktops/devices and different networks (Both cable or WIFI) in our lab. But when I went back home, using my own laptop and my home wifi, I could access to the Even I used other lab’s desktop, they could also access to the website. I tried to clear my cache and cookies, but still not work. Does anyone have similar problem and know how to resolve it? I was able to use main galaxy in our lab the day before yesterday. It looks the banned our lab to access it.