Activation of Trados Studio 2017 was failed when trying activation in new PC after deactivation in former PC.

I tried to make setting for a new PC.
Activation of Trados Studio 2017 was failed when trying activation in the new PC after deactivation of Trados Studio 2017 in a former PC. 

The error message is "activation was failed.  It is failed to connect to an activation server. Please check the address of the activation server in provider setting...."

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