java.security.policy processing values are not tranferred

My question is around the java.security.policy logic. It seems that there came up problems with JRE6 (I meet them on LINUX and on Windows). I can't get my policy files to be read . But when I set the properties within my code: System.setProperty("java.net.SocketPermission", "192.168.100.13:1024-65535, read, accept, listen, connect, resolve"); it is reported: java.net.SocketPermission=192.168.100.13:1024-65535, read, accept, listen, connect, resolve. That seems fine. But when going further in my code, I get the error: java.security.AccessControlException: access denied (java.net.SocketPermission 192.168.100.13:1096 connect,resolve) All this code worked before on Linux and on Windows. Do you have any idea?