Disabling Firewalls

[Faital_Ryu]

I was installed Graal onto my grandparent's computer, and a window from Norton Antivirus appeared right after I clicked the sign in button asking if I wanted to block it, allow, or configure manually (I think it was configure) and I clicked block out of ignorance.

Now, I can't connect because it says that a firewall's been put up and that I have to make sure that the cable's connected and that there aren't firewalls blocking Graal.

How do I remove the firewall around Graal?