Tvheadend external access issues

I am trying to make my tvheadend server available from outside my network. I have already forwarded the ports in my router, but it is not getting through.
Is there a firewall on OSMC that could be blocking the ports?

I have a static IP assigned to the pi and can get to port 80 ok. Just not the ports I need 9981+9982.

In the logs I see I get a connection and then disconnects:
“2016-10-27 13:40:12.448 htsp: Got connection from ...
2016-10-27 13:40:12.450 htsp: Disconnected”

You can close this topic.
The issue ended up being the port forwarding. I had to put each port in and not a range for some reason.