We currently have a D3600 and we are trying to setup port forwarding with customer Start/End ports, we can modify the Internal start Port but when coming to modify the Internal End Port it is not an editable text field, it seems to be calculated from the external ports result in incorrect ports being added.
I've tried this on IE (8-11), Chrome and Firefox and the issue still persists.
If you have the option "Use the same port range for Internal port" checked then it will use the same port range values of the External Starting Port and External Ending Port. If you have that same option unchecked then you will only be allowed to specify a single port value for the application that you are doing port forwarding for.
