web start超难,高手请进!!!

在网上找了个例子,下载下来后,把打好的WAR包放在JBOSS上,本机的IE能正常下载运行程序.但是局域网内的其它部分机器不能下载运行程序,部分机器能运行,且客户端装的JRE都是一样的.
JNLP文件如下:
<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0+" codebase="http://localhost:8080/fileviewer" href="index.jnlp">
 <information>
  <title>File Viewer</title>
  <vendor>IBM developerWorks</vendor>
  <homepage href="index.html"/>
  <description>File Viewer</description>
  <description kind="short">File Viewer</description>
 </information>
  <security>
     <all-permissions/>
  </security>
 <resources>
  <j2se version="1.4"/>
  <jar href="fileviewer.jar"/>
  <nativelib href="swt-lib.jar"/>
 </resources>
 <resources os="Windows"> 
  <jar href="swt-win32.jar"/>
 </resources>
 <resources os="Linux"> 
  <jar href="swt-linux.jar"/>
  <jar href="swt-pi.jar"/> 
 </resources>
 <application-desc main-class="org.eclipse.swt.examples.fileviewer.FileViewer"/>
</jnlp>怀疑是64位硬件对java的支持不好?但在这些不能运行的机器上运行sun本身提供的例子又没问题.所以应该不是这个原因.
(这是sun提供的例子:
http://java.sun.com/products/javawebstart/demos-nojavascript.html)报错是:异常:
JNLPException[category: 下载错误 : Exception: java.net.ConnectException: Connection refused: connect : LaunchDesc: null ]
at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.isLaunchFileUpdateAvailable(Unknown Source)
at com.sun.javaws.LaunchDownload.getUpdatedLaunchDesc(Unknown Source)
at com.sun.javaws.Launcher.downloadResources(Unknown Source)
at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
封装异常:java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at com.sun.javaws.net.BasicNetworkLayer.doRequest(Unknown Source)
at com.sun.javaws.net.BasicNetworkLayer.doHeadRequest(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)
at com.sun.javaws.cache.DownloadProtocol.isLaunchFileUpdateAvailable(Unknown Source)
at com.sun.javaws.LaunchDownload.getUpdatedLaunchDesc(Unknown Source)
at com.sun.javaws.Launcher.downloadResources(Unknown Source)
at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
 
  请问哪位高手知道其原因/