It's possible for it to not use any ports at all. Firewalls can block entire programs from being started as well. And block that specific program's UDP and TCP protocols from sending/receiving.
A common problem that people are mentioning with SharePort is that, any NAS or any storage for that matter, cannot be seen by wireless clients, but can be seen by wired.
What are you attaching? And, what's your network look like? Trying to connect via wired or wireless?