Often this is a problem with your DNS settings of your active NIC
These are most often defaulted to your routers IP with numbers like 192.168.xxx.xxx
You need to change those to the actual numbers from your ISP like in the screenshot attached
EDIT: After some research I realized IPTV is something specific where as when I 1st responded I thought you simply meant 'Internet TV'
IPTV, at this time, is only available to xbox360 users.