Have you tried calling Apple live support? Do you think it's free? Good luck! If you don't have a Service Care support, they will not help you. They will recommend that you search the Internet or send email to Apple support. Yes, this is a company with a market value of $400+ Billion.
Going back to the real issue "Can't connect to the iTunes Store" using your iMac, iPhone, iPod, iPad, or other iApple devices. Here's a simple guide on how to troubleshoot this problem.
- For iMac, check if you can access the Internet using any Internet browser e.g. Safari, Chrome, or Firefox. For iPhone, iPad, or iPod, use Safari browser to surf the Internet. If you can visit any website, then your Internet connection is OK. If you can't connect to the Internet, then check your Internet connection.
- Now let's check your network or computer security settings. For Network, check if you enable OpenDNS or any similar web filtering software. For OpenDNS settings, your need to NEVER block apple.com and itunes.com domain names. For computer firewall settings, you need to make sure that you are not blocking Apple and iTunes domain names.