Ssl handshake failed


I bought nuitrack pro online license.
On Ubuntu 16.04 I tried to enter the license but I get an SSL handshake failure error.
I have synchronized the system time with the server time in Korea.
Do I need to synchronize with server time in another region?

Environments currently using Nuitrack:

Region: South Korea
Operating system: Ubuntu 16.04
Camera: Kinect V2

I need your support.

Thank you.!