I know it's hard but tell more about the actual connections.
I have a windows 7 pc and a qnap ts453a nas. When i type in the nas ip address it won't connect to it. I also have a windows 8 laptop and when I do exactly the same thing with it a connection is made. I have spoken to someone at qnap and they say something is blocking it. I'm still waiting to hear back from then but can anyone help me?