Connection Error 11004

Would like some assistance. I have a friend who is having an error when he connects to the internet.  He has contacted his ISP and they have told him he is connected to the internet and possibly it was the Firewall 'On line Armour'.  Well I have just come back from being away and told him to delete the Firewall.  This he has done and still he gets the message.  Any ideas what this could be and how to resolve it??

Thanks

Tony