Please resolve the issue according to the prompt if there is, if there is not, refer to the followings.
1) The zero clients didn’t pass authorization. Also refer to article 04 above.
Resolution: Provide interne connection to the host.
2) The zero clients have connected to hosts acceeding the maximum number. Also refer to article 04 above.
Resolution: Contact our technical support team to clear the host registration log.
3) The time on the host does not match the real time.
Resolution: Change the time to match the real time.