1)A pop-up window says that the device’s serial number is invalid.
Solution: Contact our technical support team with the device’s serial number via toll free Number.
2)Unstable Local Area Network (LAN).
Solution: Examine cable and switch and make sure the zero clients are connected to the host in the same LAN.
3)IP address pool is full that new devices cannot login.
Solution: Lease more IP addresses, and recommend shorten IP address tenancy time in case there is a plenty of mobile devices connecting to the same network.
4)IP address conflict that the sign-in of one user may log the other out.
Solution: Make sure all devices use different IP address from the others in the same LAN. Recommend using default DHCP instead static IP addresses.