Samba won't work unless you punch the right holes in your firewall. Here they are:
TCP 445 TCP 139 UPD 137, 138
You could use something like the following to create these rules (Fedora / Redhat):
# iptables -I RH-Firewall-1-INPUT -s 192.168.1.0/255.255.255.0 -p tcp -m tcp --dport 445 -j ACCEPT # iptables -I RH-Firewall-1-INPUT -s 192.168.1.0/255.255.255.0 -p tcp -m tcp --dport 139 -j ACCEPT # iptables -I RH-Firewall-1-INPUT -s 192.168.1.0/255.255.255.0 -p udp -m udp --dport 137:138 -j ACCEPT
Remeber to run:
# service iptables save
to make the rules stick.