Unexpected end of file from server

Pessoal alguém sabe a provavel causa do erro abaixo.

O erro ocorre em uma rotina de impressão, dentro de um applet

java.net.SocketException: Unexpected end of file from server
 at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
 at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
 at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
 at sun.net.www.protocol.https.PluginDelegateHttpsURLConnection.getInputStream(Unknown Source)
 at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
 at sun.plugin.net.protocol.http.HttpUtils.followRedirects(Unknown Source)
 at sun.plugin.cache.CachedJarLoader.isUpToDate(Unknown Source)
 at sun.plugin.cache.CachedJarLoader.loadFromCache(Unknown Source)
 at sun.plugin.cache.CachedJarLoader.load(Unknown Source)
 at sun.plugin.cache.JarCache.get(Unknown Source)

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