I am new to Macbook.. I tired do Video between PC and Mac it won't work due to Firewall reason. But I don't have firewall on Mac and PC. I did Video between Mac and Mac and it worked fine. But not PC to Mac for some reason. Do you know why this is happening.

Modem- Ambit
ISP- Adelphia High Speed soon to be RoadRunner dunoo when.
Router- DI-624