Gradle sync failed: Connection refused

Question

So I just installed Android Studio again after a long time and it asked me to configure the proxy, so I did. I tested the connection and it worked.

Then it asked me

Answer 1

Check and review all of these files for having proxy settings:

1. YOUR_PROJECT_ROOT/App/gradle.properties
2. ~/.gradle/gradle.properties
3. ~/.AndroidStudioX.Y/config/options/proxy.settings.xml

note: replaceX.Y with your current android studio version.