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Check the unit by looking at its configuration there could be clues there.
The unit is accessed via a web browser, going to the IP address that it has been assigned by the router, in my case that's 192.168.1.102 you can pick that up from the Easy Search Utility - see previous page.

That looks straightforward, it's set up for DHCP client, so it gets an IP address assigned by the router, and the gateway is correct - it appears on the network and I can 'ping' it . . .
In Windows, click Start, All programs, select Accessories, then Command prompt
At the prompt type pint followed by the IP address of the DNS323
So the unit is there on the network and it's responding.
Let's check the rest of its configuration . . .
Looks
like the workgroup etc is set ok.
Here's
the device status screen showing all the information, as you can see the
printer port is picking up my printer correctly.
You can see here that at the moment the discs are formatted as standard format. I tried that to see if it made any difference.
Next I'll re-format as RAID 1.