I am using Internet Connection Sharing, one of my LAN pcs can't access internet while others are runnig ok.

I have 3 PCs networked. One connects directly to the internet (Say PC-1) by EDGE using a BlueTooth modem. Other two (Say PC-2 & PC-3) accesses internet by using PC-1's internet connection. PC-2 can browse the net very well. But PC-3 is troubling. I have tried connecting PC-3 directly via BlueTooth modem and it works. But the only problematic topology is that: PC-1 connected via BlueTooth modem, PC-2 & PC-3 connected to a hub that connects them to PC-1 shared internet connection. PC-2 runs fine but PC-3 just cant browse anything.