The explanation below is not always the case, however it is one possible issue that can be tracked and confirmed or denied very quickly.
Your computer’s IP or firewall’s IP address could be blocked by the server. This happens when someone from the above mentioned IP addresses attempts to access unauthorized ports by means of scanning or attempting to gain root-level access. When this happens the offending ip address is blocked in our managed firewall services. If you believe this is the case do the following:
1. Attempt to access your domain from the computer in question. Note any messages.
2. Attempt to access your domain from a machine with a different IP address (preferrably off the network).
If you’re unable to access the site from within your network but can access it
outside chances are that ip address is blocked by the server. Obtain your IP addresses that can not access the server at AIT (you can use services such as whatismyip.com to determine your IP address) and provide that to AIT via a trouble ticket.