I fixed this on my own! Thanks!
The directions say I need to open port 50001 on my firewall. Internally the box is 192.168.10.70. Since it does other things and is web manageable, I have this statement in my firewall (fake real IPs):
static (inside,outside) tcp 126.96.36.199 www 192.168.10.70 www netmask 255.255.255.255 0 0
access-list outside_access_in permit tcp any host 188.8.131.52 eq www