message_die(GENERAL_ERROR,"YubiCloud authentication not configured. Add \$Config['YubiCloud']['ClientID'] and \$Config['YubiCloud']['SecretKey'] to your config.");
}
if(!$key=$_GET['OTP']){
message_die(GENERAL_ERROR,"Please add in URL ?OTP=, then put your cursor at right of the = and press your YubiKey button");