I am well aware of this possibility, I usually forward WAN:8080 to LAN:80 and can access the device WebUI.
However, in this particular case, I do not use a browser but a device configuration program, and this program uses port 80 and I cannot change that. So I need to forward WAN:80 to LAN:80 to access the device using the config.pgm.
And if I do, I am afraid I will not be able to access the RUT WebUI after that.
Is it possible to restore the port forwarding by Telnet, SSH or even an SMS to the R240?