Java Web Start - JNLP Problem

I'm trying to load an application via Java Web Start & Apache 2.0.49.  When I follow the link to my JNLP file, I get an "Unable to load resource" message.  The application is being launched within a private subnet wich restricted access to the internet through a proxy server.  The web server resides within the private subnet so I don't believe that a firewall is the issue.  

The jnlp file and errors generated are below.

<?xml version="1.0" encoding="utf-8"?>

<!-- FMS JNLP File  -->

<jnlp

  spec="1.0+"

  codebase="http://fmssql/WebApp/FMS"

  href="FMS.jnlp">

  <information>

    <title>PROGRAM TITLE</title>

    <vendor>My Name</vendor>

    <homepage href="http://fmssql"/>

  </information>

  <security>

    <all-permissions/>

  </security>

  <resources>

    <j2se version="1.2+"/>

    <jar href="FMSJWS.jar"/>

  </resources>

  <application-desc main-class="MainMenu">

    <argument>arg1</argument>

    <argument>arg2</argument>

  </application-desc>

</jnlp>



JNLPException[category: Download Error : Exception: java.io.IOException: HTTP response 404 : 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)




java.io.IOException: HTTP response 404

      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)


Thanks,
David