Several people have noticed a warning when trying to reach the game server at https://live.cardhunter.com. Depending on your browser, this warning may take several forms, but the essence is that the SSL certificate is issued for *.cloudfront.net, not live.cardhunter.com. This is because we host the game client on Amazon's cloudfront network and they don't allow us to use our own SSL certificate. You should be able to work around this by telling your browser to accept the certificate anyway or just go to http://live.cardhunter.com instead.
There does appear to be a bug right now with the links from inside the game client that is opening "localhost" instead of "accounts.cardhunter.com" for both registration and forgot password. If you're using the link out of an email containing a beta key, it should be correct and shouldn't be giving you a warning.