title: SonarQube Proxy Configuration, Tricky
body: <p>I cannot get the proxy configuration to work for SonarQube 4.0 so that I can install plugins.</p>
  
  <p>When i open <code>http://localhost:9000/updatecenter/available</code> it displays the error: "Not connected to update center. Please check your internet connection and logs."</p>
  
  <p>In sonar.log I read: "org.sonar.api.utils.HttpDownloader$HttpException: Fail to download [http://update.sonarsource.org/update-center.properties]. Response code: 403"</p>
  
  <p>In sonar.properties I configured it with the same proxy which I use for other programs:</p>
  
  <pre><code>sonar.updatecenter.activate=true
  http.proxyHost=&lt;host&gt;
  http.proxyPort=&lt;port&gt;
  http.proxyUser=&lt;username&gt;
  http.proxyPassword=&lt;password&gt;
  </code></pre>
  
  <p>I tried the same to configure in wrapper.properties, but it didn't work either by the way.</p>
  
  <p>For the proxy host I tried the short and the full name. For the username I tried just the username and with <code>&lt;DOMAINNAME&gt;\&lt;username&gt;</code> and <code>&lt;DOMAINNAME&gt;\\&lt;username&gt;</code>.</p>
  
  <p>Nothing of it worked. Any ideas?</p>