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Google ist Dein Freund:

When you migrate a secure news account from Netscape Communicator to Netscape 6, or when you add a secure newsgroup account, you can't access the newsgroup server and read messages until you edit the server's account settings. Do this:

1. Open the Edit menu and choose Mail/News Account Settings.
2. Find the secure news server account (in the list on the left), and choose "Server" under it.
3. Next to Port, type the server's port number (the default port number is 563).
4. Put a checkmark next to "use secure connection (SSL)".
5. Click OK.

The Subscribe dialog box may not work with news servers that require authentication. If you open a password-protected newsgroup you may be prompted more than once for the username and password combination.

http://home.netscape.com/eng/mozilla.../6.0.html#mail