Error “Gradle sync failed: Connection refused: connect”

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You should configure Proxy settings in Android Studio’s menu (File → Settings). Another strategy is to configure the file gradle.properties.

So, add these lines at the end of gradle.properties, located on the app folder base.

systemProp.http.proxyPassword=[PASSWORD]
systemProp.http.proxyHost=[IP ADDRESS]
systemProp.https.proxyPort=[PORT, TYPICALLY 3128]
systemProp.https.proxyUser=[USERNAME]
systemProp.https.proxyHost=[IP ADDRESS]
systemProp.https.proxyPassword=[PASSWORD]
systemProp.http.proxyPort=[PORT, TYPICALLY 3128]
systemProp.http.proxyUser=[USERNAME]

Pay attention. The passwords and other values that have special characters must have slash character such as (\#) and so on.

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