Issue:
Getting 'java.net.UnknownHostException' error while activating in Katalon Studio
Solution:
If you are behind a private network, please refer to this documentation to configure Proxy for Authentication and whitelist domains:
https://docs.katalon.com/katalon-studio/docs/configure-proxy.html
Moreover, you can click on Help menu > Error log then look at the error message carefully, it will show you which domain you should whitelist, for example:

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