First of all, I am not well skilled in the art of networking so bare with me.
I have a Synology DS411 server that I am trying to setup and it requires port forwarding. In the Network area I add a new Port Map, name it Synology and proceed to enter the numbers as directed. Public TCP and Private TCP need to be set to 5000 and the Private IP to the IP of the DS411. The Private IP stays set but when I update the router and check on the settings later, it takes out the 5000 from the TCP settings.