Hi Steve,
There are three ways to connect to my QNAP. One is via the 'QFinder' app' which is specific to the QNAP and provides a web based interface for access to Administration and other services such as 'Web File Manager'.
The second method is via 'Connect To Server' in the 'Finder' menu under 'Go'. It is here that I connect to the NAS for normal file maintenance such as copying etc.
It is here I enter the IP address of the NAS.
The third method is to connect via Finder/Network
I have always found the second method more reliable for me. It's habit I guess.
Hope this helps.
Col.