关于Java web start启动时错误的一个问题

UnixZC

Java web start启动后出现如下一个错误:
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常规:
启动/运行应用程序时发生错误。

标题：zcyds3f8.asiapac.javesun.com
供应商：Javesun, Inc.
类别：下载错误

损坏的 JAR 文件位于 https://zcyds3f8.asiapac.javesun ... ginJars/pam/paf.jar
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异常:
JNLPException[category: 下载错误 : Exception: java.util.zip.ZipException: error in opening zip file : LaunchDesc: null ]
        at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)
        at com.sun.javaws.cache.DownloadProtocol.getResource(Unknown Source)
        at com.sun.javaws.LaunchDownload.downloadJarFiles(Unknown Source)
        at com.sun.javaws.LaunchDownload.downloadEagerorAll(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)
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封装异常:
java.util.zip.ZipException: error in opening zip file
        at java.util.zip.ZipFile.open(Native Method)
        at java.util.zip.ZipFile.<init>(Unknown Source)
        at java.util.jar.JarFile.<init>(Unknown Source)
        at java.util.jar.JarFile.<init>(Unknown Source)
        at com.sun.javaws.cache.DownloadProtocol$RetrieveAction.actionDownload(Unknown Source)
        at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)
        at com.sun.javaws.cache.DownloadProtocol.getResource(Unknown Source)
        at com.sun.javaws.LaunchDownload.downloadJarFiles(Unknown Source)
        at com.sun.javaws.LaunchDownload.downloadEagerorAll(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)
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我试了直接在浏览器中输入https://zcyds3f8.asiapac.javesun ... ginJars/pam/paf.jar是可以下载这个文件的,且这个文件也能解压没有问题,那位老大知道这是为什么吗?