You need to add an exception to the firewall, so that it allows toribash to access the internet. If you're using windows 7 (like me), this is acheived by going to control panel > system and security > windows firewall and then clicking the link to the left which says something like "allow a program through the firewall". Then, press "allow another program" at the bottom of the window and select toribash, ensuring that the box is ticked.
If you are using another windows operating system, I suspect the process will be similar, and googling it should suffice.