Checkout the FAQ.
The .NET Terrarium will run if you are behind a network address translator and it will be able to connect to the discovery server but it will not be able to receive creatures from other peers. This is because the peers cannot directly access a machine that is behind a NAT without making a configuration change to the NAT.
To make the necessary configuration change, right click on the Terrarium screen and select "Game Settings.", click on the "Server" tab on the screen that comes up and check "Enable Nat/Firewall support". You need to modify the NAT device to map the TCP port 50000 on the device to port 50000 on the machine that is running the .NET Terrarium. The steps involved in mapping the port will vary depending on what type of NAT is being used. Check your NAT device documentation for information on how to map ports from the NAT to a private internal machine.
For more information on network address translators, see the NAT Terminology and Considerations RFC. http://www.windowsforms.net/Terrarium/docs/InitialSetup/faq.aspx#3_4
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