One of the following two possibilities might have caused the problem:
There are two ways to solve the firewall problem:
1. Ask the system administrator of your intranet to reconfigure the firewall correctly, or
2. Modify Netscape's preferences "manually" by editing your Preferences file.
The name and location of this file varies from platform to platform:
Be sure to edit this file only while all instances of Netscape are shut down, as Netscape will overwrite the file when it exits.
Macintosh: System Folder:Preferences:Netscape f:Netscape Preferences UNIX: ~/.netscape/preferences.js Windows: \Program Files\Netscape\Users\<username>\prefs.js
To enable the preference, add this line to the Preferences file: