Activation Fail error. - can’t access https://checksid.cuba-platform.com

Hi,
I am installing cuba on mac os, I have a worked license on windows. But while I try to register on the mac, it errored saying Activation Failed.

I searched other topic, found that https://checksid.cuba-platform.com is not accessible here. I am in China.

Hi,
Which version of Studio do you use? Do you work behind proxy?
Try to ping checksid.cuba-platform.com. Is it accessible?

Hi,
Sorry for reply late, now the register is ok. I did not ping the address that day. But today, ping it with reply successfully.