The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
@mostlostnoob said in Problem when authorizing Client - ERR_CONNECTION_REFUSED:
@samae1 Try either changing the Default Browser in Windows Settings &/or clearing your browser cache.
@Samae1 May I suggest Vivaldi.
I know Windows is getting increasingly obtuse with how you go about changing your default applications like the browser.