Thank you for your answer 

I also noticed that some connetions are trying to go throught firewall, so I allowed them.
I don´t know which port open made that, but it almost immediately gave me 1 IN peer for BTC/LTC/VTC p2pool.

These are open ports:
5889, 8332, 8333, 9171, 9172, 9327, 9328, 9332, 9333, 9338, 9346, 10333