Hmmm. Ok, I tried putting the PAP2T on the same LAN as the trixbox server to see if I would have the same problem. On the same LAN, I don't have any of the issues that I reported in the original post which is good. So, this problem occurs when the PAP2T is remote in either case (a) where the PAP2T is behind NAT on another network connecting via port forwarding to connect or in case (b) where the PAP2T is on a remote network at the end of a VPN tunnel to another pfsense box.