How to block and unblock the media ports in MAC OSX 10.9? I am working on a test project that requires me to block all media ports on my Mac OS X 10.9. 

The instructions I'be veen given are "Chinese" to me :-) I have no idea how and where to start, let alone how to unblock them after I manage to block them... 

Thanks so much!

Instructions available: 

[User]-iMac:~ [User]$ sudo ipfw add deny udp from any to any dst-port 50000-65535
00100 deny udp from any to any dst-port 50000-65535
[User]-iMac:~ [User]$ sudo ipfw list
00100 deny udp from any to any dst-port 50000-65535
65535 allow ip from any to any
Maybe you can use Little Snitch instead of trying to figure out the commands.

HTH