I have checked the seetings I have port forwarding set for a webcam and it works fine. I have set the remote management to a port I have used with another router's remote management (which worked fine) but it doesn't work with this router. I tried a separate port forwarding rule in the port forwarding section, but it gave me an error, saying that port conflicts that said "Remote Admin Port conflict".
So that tells me the router is recognizing the port but is not allowing the access to the manager remotely.
This is not a dyndns issue, since I can access the router remotely using my IP address currently assigned by my ISP. I can access my webcam. so this is not an issue with the ISP or with the internet modem. I can get to the webcam fine (so I know the router port forwarding is working fine and I know mu IP address gets me to the router).
this issue seems to be that the setup (on the tools/admin screen) when set to allow remote access and using the default or another port, doesn't seem to work.