I doubt your particular IP is banned, or if it was, you'd get the message telling you so.
It's possible there is a banned IP through the route from your provider to the Vault, stopping one from visiting.
You can do a traceroute to verify.
In Windows, select Start > Programs > Accessories > Command Prompt. This will give you a window with a DOS prompt.
Enter the word tracert, followed by a space, then the domain name.
tracert neverwintervault.org
This is extremely useful when trying to find out why a website is unreachable, as you will be able to see where the connection fails.
FP!