SocketPermission

if (System.getSecurityManager() == null) {  
//Não existe security manager, deve ser criado  
     System.setSecurityManager(new RMISecurityManager());  
}

SecurityManager sm = System.getSecurityManager();

SocketPermission p2 = new SocketPermission("*:1024-", “accept,connect,resolve”);

sm.checkPermission(p2);