How to activate KRE with Proxy settings?

Firstly, the thing you need to do is to whitelist the wildcard Katalon domain (*.katalon.com). Then make sure the necessary proxy arguments are included in the command line. Use MANUAL_CONFIG for the proxy option, and make sure the credentials are correct. Avoid copying from another text editor because it may contain invisible/invalid characters that do not get recognized by Katalon.

See also: 

• Configure Proxy for Authentication 

• Proxy Preferences