Die vorzunehmende Einstellung:
You can modify Communicator preferences "manually" by editing your
Preferences file.
The name and location of this file varies from platform to platform:
On Windows 95 and NT, \Program Files\Netscape\Users\\prefs.js
On UNIX, ~/.netscape/preferences.js
On Macintosh, "System Folder:Preferences:Netscape f:Netscape Preferences"
Be sure to edit this file only while all instances of Communicator are shut
down, as Communicator will overwrite prefs.js when it exits.
To enable the preference, add this line to the Preferences file:
user_pref("security.lower_java_network_security_by_trusting_proxies",true);
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Die genaue Erklärung für diese Prozedur:
When a Java Applet attempts to "phone home", or make a socket
connection to its originating host, Communicator will first
perform a DNS lookup to prevent certain "spoofing" attacks.
In some intranets, DNS lookup for external hosts is disabled,
and all external traffic goes through a proxy. In this situation,
the applet will normally fail to make the desired connection.
With this preference enabled, if the lookup fails, then textual
name equivalence is used to determine if the class can make a
connection. This option causes the "name of the home" to be relied
upon rather than the stricter DNS/IP address.
This is one of the few "hidden" security preference which end users
in some intranets may need to enable.
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Wir danken
Wolfgang Michael Terenyi
(Mitarbeiter bei Novartis und im Elternverein des Akademischen Gymnasiums Wien)
für die Lösung des Problems.
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