I am trying to access a secure site for my online school. At home, both my desktop and my lap top come up with the page "Server not found" upon attempting to log in. ALL other websites are working fine. On public wifi at a coffee shop, the website works fine. I asked my school's IT about this, and the told me to speak to my ISP (CenturyLink). I did, and they were not able to give me a solution and referred me back to my school's IT department. I know it is not an issue with the school's website, since it worked fine on a different network. I have also tried to load the website on Chrome and IE, and none of them will let me log onto the site on my home network.

Any help would be much appreciated!