Java Security

hi everybody,

I'm trying to get CODEBASE PRINCIPALS running in Netscape 4.72, as I want to access
an applet from a client application over TCP.
I've added the Line:

user_pref("signed.applets.codebase_principal_support",true);

in the prefs.js file.
In the applet I use the code:

netscape.security.PrivilegeManager.enablePrivilege("UniversalConnect");

but still I get the following Exception:

netscape.security.AppletSecurityException: security.Couldn't connect to '141.77.20.176' with origin from ''.

Is there mybe something missing in Netscape configurations?

Thanks for any hints!