networking - Can't access port 80 on public IP

I have an ubuntu box at a local IP behind an Arris router from my ISP. I've setup port forwarding on the router for port 80 such that it forwards TCP/UPD to the local IP of the ubuntu box.

However, I cannot telnet using the public IP, and I can't access apache's welcome page on ubuntu via the public IP. I can telnet to ubunut's local ip from my mac on port 80 and can ssh into it as well. I have also disabled the firewall on Ubuntu for testing, yet I'm still unable to access ubuntu via the public IP.

I have checked and port 80 is open on the public IP so is 22, but not 21.

Not sure where to go from here. Any advice?

Edit: The output of traceroute is as follows:

traceroute to 72.24.237.82 (72.24.237.82), 30 hops max, 60 byte packets
praha-4d-c1-vl55.masterinter.net (77.93.199.253)  0.499 ms  0.493 ms  0.544 ms
ae-5-5.car1.KansasCity1.Level3.net (4.69.135.229)  149.079 ms           

CABLEONE.car1.KansasCity1.Level3.net (4.53.32.30)  146.839 ms  146.722 ms
CABLEONE.car1.KansasCity1.Level3.net (4.53.32.30)  146.163 ms  146.822 ms *
* * *
* * *

Which I think means that CABLEONE.car1.KansasCity1.Level3.net is not allowing anything to get past it. But what does that mean exactly?

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