Github user scwf commented on a diff in the pull request:

    https://github.com/apache/spark/pull/1980#discussion_r18432556
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/JettyUtils.scala ---
    @@ -180,12 +186,32 @@ private[spark] object JettyUtils extends Logging {
           serverName: String = ""): ServerInfo = {
     
         val collection = new ContextHandlerCollection
    -    collection.setHandlers(handlers.toArray)
         addFilters(handlers, conf)
     
         // Bind to the given port, or throw a java.net.BindException if the 
port is occupied
         def connect(currentPort: Int): (Server, Int) = {
    -      val server = new Server(new InetSocketAddress(hostName, currentPort))
    +      val server = new Server
    +      // Create a connector on port currentPort to listen for HTTP requests
    +      val httpConnector = new SelectChannelConnector()
    +      httpConnector.setPort(currentPort)
    +      httpConnector.setHost(hostName)
    +
    +      if (conf.get("spark.ui.https.enabled", "false").toBoolean) {
    +        // / If the new port wraps around, do not try a privilege port
    +        val securePort = (currentPort + 1 - 1024) % (65536 - 1024) + 1024
    --- End diff --
    
    Hey, note ```connect``` will be passed to ```Utils.startServiceOnPort```, 
so in ```Utils.startServiceOnPort``` it will try to start http service on 
currentPort and https service on securePort. If securePort is not free, it will 
try again until the maximum number of retries


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