title: Netbeans update fail
body: <p>I have no problem in my internet connection. But getting every time this screen when I try to update netbeans plugins or IDE itself. </p>
  
  <p><img src="https://i.stack.imgur.com/f4Pvo.png" alt="Window titled &quot;NetBeans IDE Installer&quot;. Text in upper portion: &quot;Welcome to the NetBeans IDE Plugin Installer. The installer will download, verify and then install the selected plugins.&quot; Text in lower portion: &quot;Checking for updates failed. Check your network connection, verify that your proxy settings are configured correctly in the NetBeans IDE, or try again later.&quot;"></p>
  
  <p>Even OS reintallation doesn't fix this issue. Getting same error again and again. How can I fix it?</p>