I have an applet that throws this exception when trying to communicate with the server (running on localhost). This problem is limited to Applets only - a POJO client is able to communicate with the exact same server without any problem.

Exception in thread "AWT-EventQueue-1" java.security.AccessControlException: access denied (java.net
.SocketPermission 127.0.0.1:9999 connect,resolve)
        at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)

My applet.policy file's contents is:

grant {
permission java.security.AllPermission;
};

My question is what are the other places where I need to modify my security settings to grant an Applet more security settings?

Thank you.

EDIT: Further investigation has lead me to find that this problem only occurs on some machines - but not others. So it could be a machine level (global) setting that is causing this, rather than a application-specific setting such as the one in the applet.policy file.

EDIT: Another SO question: Socket connection to originating server of an unsigned Java applet
This seems to describe the exact same problem, and Tom Hawtin - tackline 's answer provides the reason why (a security patch released that disallows applets from connecting to localhost). Bearing this in mind, how do I grant the applet the security settings such that in can indeed run on my machine. Also why does it run as-is on other machines but not mine?