Why can't I get turbotax to connect to the internet to activate my turbotax desktop. I have internet and already set up exceptions etc with my virus/firewall software?

I keep getting the message that I am not connected to the internet and to check my virus/firewall settings. I re-installed, added exceptions to virus/firewall for all the turbotax programs even though my firewall software said it was allowing turbo tax through and virus software was not blocking it.