Okay, so got things working. Second ethernet card wasn't configured.
sudo nano /etc/network/interfaces
auto eth0
iface eth0 inet static
address aaa.bbb.ccc.ddd
gateway aaa.bbb.ccc.eee
auto eth1
iface eth1 inet static
address aaa.bbb.ccc.fff
gateway aaa.bbb.ccc.ggg
sudo ifconfig eth1 up
sudo /etc/init.d/networking restart
Then had to make sure firewalls were working...
sudo iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
sudo iptables -A INPUT -p tcp --dport ssh -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 443 -j ACCEPT
sudo iptables -L -n -v
Then confirmed the site was running on the correct IP address with a big of curl...
curl -XGET http://aaa.bbb.ccc.fff/main.js