Oki this doesn't seem to be working for other people but is working fine for me :-(
> Get to the login screen in spiral knights and press "facebook"
> Browser window should open and prompt for login details, click sign in through steam
> follow prompts and it _should_ log you in... seems to be working for me.
Credit: http://forums.spiralknights.com/en/node/55666#comment-395437
I've tried this too, and it doesn't seem to work.
I was told this is the fix to those "can't connect to server" issues.