Here's my problem:
1. I have a single board computer monitoring system behind a router at 192.168.0.10
2. Inside the lan I can talk to the computer with HyperTerm on port 23 no problem
3. I've set up my router 192.168.0.1, port forwarding port 23 to 192.168.0.10 on TCP
4. I cannot reach the destination from outside. Port scanning programs confirm that 23 is closed. his is the second router I've tried (it's an Airlink AR675W). Never had problems like this before. The single board computer is a sewage monitoring system that is apparently installed in many locations.
One other tidbit - the Internet conection is rural, and I believe it is being deivered to this location wirelessly. I can't see the source box here, but the box just before the router is an Alvarion "IDU", whatever that is.
Any way I can troubleshoot this? i've never had issues port-forwarding before. I mystified!