30 December 2013
Servers will need to be updated before you can join them, and your client will obviously have to be up to date. If your client isn't updating try restarting Steam.
Thanks for sticking with us and being patient while we've muddled our way through these issues. The servers aren't bulletproof, but hopefully we've made it a bit harder to completely take them down.
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We'll only update you about this project, we won't spam you about other stuff or sell your email address.