Scripted movie won't run outside of firewall...open multiple ports?

Question

I'm new to Flash and AS3, but with the help of many examples I have managed to created a scripted movie using some time lapse photography.  I load the images from an XML file and use an event listener to add each image as a child of a movie clip.  As the number of children grew, it caused the frame rate to slow, so I figured out that I could remove them after they were viewed and just keep looping through the array.
This works great on the local machine and when served up from the web server behind the firewall.  However,  if I try to access the file from outside the firewall, it loads the first image or two very slowly (if at all) then hangs.  I've performed a net stat from the server and noticed that it is opening an inordinate number of connections to the remote client on various client ports (from 6 to 60+).
Any help would be greatly appreciated!  The code I'm using is below...
// Input Parameters
var ssxml:String = "myfile.xml"; // file containing images & dates
// Stage settings
var swfStage:Stage = this.stage;
var swfFrameRate:int = 10;
swfStage.scaleMode = StageScaleMode.NO_SCALE;
//  Movie Clip
var mc:MovieClip = new MovieClip();  // initiate movie clip
mc.x      = 25;     // starting point X
mc.y      = 50;     // starting point Y
//  Text Field
var tf:TextField = this.dtsText;
// Cropping Rectangle
var cr:Sprite = new Sprite();
cr.graphics.beginFill(0x057072);
cr.graphics.drawRect(25,50,550,7);
cr.graphics.endFill();
// Read Flash Variables
try {
var keyStr:String;
var valueStr:String;
var paramObj:Object = LoaderInfo(this.root.loaderInfo).parameters;
for (keyStr in paramObj) {
  valueStr = String(paramObj[keyStr]);
  if (keyStr == "srcFile") {
   ssxml = valueStr;
  if (keyStr == "swfFrameRate") {
   swfFrameRate = int(valueStr);
   swfStage.frameRate = swfFrameRate;
} catch (error:Error) {
trace (error.message);
*  Configure a loader to import the list of images and date
*  time stamps from an XML file. The list of variables will
*  be stored in arrays.
var photos_xml:XML
var xmlLdr:URLLoader = new URLLoader();
xmlLdr.addEventListener(Event.COMPLETE, completeHandler);
xmlLdr.load(new URLRequest(ssxml));
var img_array:Array = new Array(); // images
var dts_array:Array = new Array(); // date time stamps
var img_count:int   = 0;
function completeHandler(event:Event):void {
try {
  photos_xml = new XML(event.target.data);
  var imgs:XMLList = photos_xml.img;  
  var dtss:XMLList = photos_xml.dts;    
  img_count = imgs.length();
  for (var i=0;i<img_count;i++) {
   img_array.push({src:imgs[i].text()});
   dts_array.push({src:dtss[i].text()});
} catch(error:Error){
  trace(error.message);
var nextImg:int = 0;
var imgLdr:Loader = new Loader();
imgLdr.contentLoaderInfo.addEventListener(Event.COMPLETE, doneLoad);
imgLdr.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, loadError);
imgLdr.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, updateInfo);
stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
function enterFrameHandler(event:Event):void {
try {
         if (img_array.length > 0 ) {
   loadInitialImage();
} catch(error:Error){
  trace(error.message);
function loadInitialImage():void {
imgLdr.load(new URLRequest(img_array[nextImg].src));
function doneLoad(event:Event):void {
var theImage:DisplayObject = event.target.content;
imgLdr.unload();
var bm:Bitmap = theImage as Bitmap;
mc.addChild(bm);
mc.scaleX = 550/640;
mc.scaleY = mc.scaleX;
addChild(mc);
addChild(cr);
tf.text = dts_array[nextImg].src;  
if (mc.numChildren > 1){
  mc.removeChildAt(0);
nextImg = (nextImg+1)%img_count;
function loadError($event:IOErrorEvent):void {
tf.text = "Loading Data.....Please Stand By..........."; 
//  Loader Progress
var swfTF:TextField = new TextField();
swfTF.autoSize = TextFieldAutoSize.LEFT;
swfTF.border = false;
addChild(swfTF);
//swfTF.text = "srcFile: " + ssxml + " FR: " + swfFrameRate;
function updateInfo($event:ProgressEvent):void {
swfTF.text =  "srcFile: " + ssxml + " FR: " + swfFrameRate
     + " Loading: " + img_array[nextImg].src + " "
     + Math.floor($event.bytesLoaded/1024)
     + " KB of "
     + Math.floor($event.bytesTotal/1024)
     + " KB.";

Answer 1

OK I figured it out.  Apparently, the ENTER_FRAME event continues firing even as the image loader is processing.  Outside the firewall, where it was taking longer to load the images, this was causing loadInitialImage() to request the same image over and over again which resulted in the port behavior I was seeing on the server as well as the client "locking up".  The simple fix was to add a variable called currentImg (initialized to -1) which I set equal nextImg in loadInitialImage().  I then modified the if statement in enterFrameHandler() to only call loadInitialImage() if nextImg != currentImage.