Well here's my case.
I have two pcs connected in a WLAN. PC1 has its wireless connection bridged with a ethernet connection to a dsl router so as to have internet on PC2.
However, even if Internet works fine there's no way to ping PC2 from PC1 or PC1 from PC2(100% packets lost). As a matter of fact, I cannot even share its resources (It gives me the network path not found error and you dont have the sufficient rights) Anyway, I can see from PC2 the Pc1 from mshome workgroup whereas from pc1 i cannot even access the workgroup. I have disabled all kind of router or desktop firewalls. It's also mentionable that when I disable the bridge and connect only with wireless networks everything works fine (sharing etc.) but when i disable ethernet connection with router in my bridged connection (which seems pretty much the same thing) i get the same error.
p.s. all ips seems fine and router configuration is flawlessly set.
Thanks in advance.