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Trusting Proxy Servers
If you're using Netscape Communicator and your firewall prohibits external
DNS lookup, then a security exception may prevent you from running this
demonstration over the Internet. You can fix this by telling Communicator
to trust the web proxy server to do the DNS lookup. Edit your Preferences
file while Communicator is not running, to add the line:
user_pref("security.lower_java_network_security_by_trusting_proxies", true);
The preferences file is located:
Windows 95 and NT
\Program Files\Netscape\Users\\prefs.js
UNIX
~/.netscape/preferences.js
MacOS
System Folder:Preferences:Netscape f:Netscape Preferences
If you are concerned about "DNS spoofing" attacks, you may wish to
change your preferences back after trying the demonstration. For more
information on DNS spoofing, see Princeton University's description
of the attack scenario , Sun Microsystem's discussion
of the security issues , and Netscape's description of Security
Preferences for Communicator.
