Call your ISP and ask them to unblock the ones you need. You pay for their service, it's their job to give you what you pay for (assuming you're not using college/university internet access).
According to portforward.com, you need TCP 1024 and 7000, and UDP ports 1024 and 6000. Though my server seems to be configured with 5999. If that fails you will need a VPN. I don't recommend Hamachi for this as it's what is referred to as a "dumbed down" VPN adn doesn't provide full services.
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-GD
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