Hello Mark,
Have a look at the Marius YO2LOJ
post from 6th August 21:47 CEST.
It's last minute software made by Marius.
You may try this:
http://www.yo2loj.ro/hamprojects/amprd-1.0.tgz
On my Raspberry Pi it works smoothly
behind my own router.
But... I do not have even tiny firewall up&running.
Best regards.
Tom - sp2lob