You should modify the server.address: option in the "C:\Program Files\Storj\Storage Node\config.yaml" (please, use the Notepad++ for that). It should be server.address: :7000.
Change the contact.external-address: option, it should contain your external address with port contact.external-address: mega-storage.asuscomm.com:7000.
Save the config and restart the storagenode service.