Genymotion Desktop needs to connect to our servers to be able to verify the credentials and license validity. This error means that something is blocking Genymotion from accessing the Internet.
If you use a proxy or any network tool, such as a VPN, that can modify the network stream, please add exceptions for Genymotion Desktop.
See Genymotion Desktop and firewalls. and Genymotion Desktop and VPN.