title: Android studio on mac: remove proxy settings
body: <p>I work on macOS High Sierra with Android Studio 3.1 (same problem with 2.3).</p>
  
  <p>I had previously a proxy settings, but actually we stop using proxy.</p>
  
  <p>When i try to update gradle to 4.4 (or other version) android studio apprently continue to use an old proxy settings.</p>
  
  <pre><code>Caused by: org.gradle.internal.resolve.ModuleVersionResolveException: Could not resolve com.android.tools.build:gradle:4.4.
  Caused by: org.gradle.api.resources.ResourceException: Could not get resource 'https://jcenter.bintray.com/com/android/tools/build/gradle/4.4/gradle-4.4.pom'.
  Caused by: org.gradle.internal.resource.transport.http.HttpRequestException: Could not GET 'https://jcenter.bintray.com/com/android/tools/build/gradle/4.4/gradle-4.4.pom'.
  Caused by: org.apache.http.conn.ConnectTimeoutException: Connect to proxy-********:8080 [proxy-********/172.20.10.5] failed: connect timed out
  </code></pre>
  
  <p>I already disabled the proxy in preferences > system settings > HTTP Proxy.</p>
  
  <p>Someone have an idea?</p>