Vengeance

I have been trying to get a meterpreter session over WAN using a reverse tcp attack for a while now and i'm pretty stuck. My attack works fine on LAN and I have port forwarding set up to sent the session to my listener on port 4444. I can get a netcat session over WAN so i know the port forwarding is set up correctly but meterpreter doesn't seem to be receiving any connections. Any thoughts?