This tells you that you haven't
previously connected to this server.
If you've
previously connected to the server and see this message, this indicates the server administrator has changed the key fingerprint or you're being tricked into connecting to an imposter server.
Not exact matches
You can
connect to the
servers to download most of the
previously made levels on the Wii U version.
Your app
connects to an email
server, downloads all messages
to your PC that have not been
previously downloaded, and then deletes the original emails from the
server.
This issue can happen after suspending or when trying
to quickly reconnect
to a
server previously connected to.