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[simoncn]

AudioStation can play music from the NAS hard drive to a UPnP renderer but it cannot play music that is streamed from a UPnP server. This is the case even if the UPnP server (MinimServer) is running on the same NAS as AudioStation.

Your need to redirect these ports to access MinimServer suggests to me that you might be running the Synology firewall on the the NAS and this is blocking access to these ports.

In this case, you need to change the settings in the Synology firewall to enable inbound connections to UDP port 1900 and TCP ports 9790 and 9791. You can do this from Control Panel > Security by selecting the Firewall tab and creating a firewall rule. When creating the firewall rule, use the option "Select from a list of built-in applications" and enable the TCP and UDP settings for Built-in Applications > MinimServer UPnP media server.