Port forwarding trough series of routers what could I be doing wrong?

Port forwarding trough series of routers what could I be doing wrong?

Im having this problem and don't know what to try. I have: BrazilFW->Dlink
dir-300->Linksys WRT54G2->Linksys WRT54G. All with the last firmware
versions
this configuration: BrazilFW WAN: Internet LAN: 192.168.1.1 Dlink dir-300
WAN: 192.168.1.239 LAN: 10.10.0.1 Linksys WRT54G2 WAN: 10.0.0.50 LAN:
172.16.0.1 Linksys WRT54G WAN (not connected to wan port, working as AP):
172.16.0.100
Between each router (not the last one, that works as AP) there is a LAN
that doesn't have to communicate with the other LANs.
I opened ports that I forward to get from internet to each router. Dlink
port 8080 WRT54G2: 8082 WRT54G: 8085
I can get into the configuration of the Dlink and the WRT54G2, I can't
connect to the last router (it has enabled the wan access and selected the
8085 port, I have connection from the LAN side thought team viewer on one
of the PCs connected to that router, I can ping the router IP 172.16.0.100
from the previous router diagnostic page.). Any idea of what can be
happening?
I also try to forward Dlink port 80 so: Internet_Ip:8085 BrazilFW
8085->8085 Dlink 8085->80 WRT54G 80->80, cant get either. Any idea of what
can I be forgetting? Thanks!