When I start Terrarium, it gives me this dialog box:

"Unable to verify this version is enabled.

Failed to contact server 'http://www.terrariumgame.net/Terrarium'

Do you wish to continue running the client?"

If I click "yes", it gives me red lights in the game.

I don't have a firewall running. I uninstalled Zonealarm, and my cable connection doesn't come with one of those routers with a firewall built in.

That is a fairly big issue... I'd make sure that you are running the appropriate client for the namespace you are attacking there. Mitch made a post that there were two or three separate servers, each one for a different client. If you are running the latest client, then everything should work and we might have a little something to look at.

Let me know if you find anything. I've been trying to run Terrarium on a series of several different machines over a period of a couple of years and have never found a machine which would let me hook to the server. I'm currently running Windows XP Media Center edition, SP2. I went into the security center and made sure that Terrarium 1.2 was on the exception list (it was). Still I can't connect. No Norton or other firewalls.