How to open TCP/UDP ports?

Hi, recently I started poking at my mac, and I blocked some ports from the terminal... My question is how to open them again?
I found a way to block them, but not how to undo it...
Any help, please?

Yes, it is blocked in the whole of middle east. Its like if you buy the device from middle east you wont be even able to use Facetime outside it which is a very poor thing.
I was lucky enough to be told that facetime doesnot work in the UAE just before i could made a bill. I was planning to buy an iphone 5 from Dubai.
Luckily i got a US based version from a local vendor and on that Facetime does work. Just the UAE based models do not have facetime on it working.
Try to search for US based version if you looking out for facetime.

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