Fordem, at the bottom of your last post you mention 'either no address set or an address in a different subnet'.
I have set the DNS IP using the web configuration (192.168.1.200) - I don't understand what I need to do with the subnet issue (or what to check). Any help appreciated.
Ta
An ip address has two separate parts, a network portion & a host portion, and it is the subnet mask that determines where the one stops and the other starts. With a typical consumer network, the subnet mask will be 255.255.255.0 (and please don't change it unless you know why you're changing it) so that the ip address which will probably look like 192.168.x.y where x & y are numbers between 1~254 will split in to a network portion of 192.168.x and a host portion of y.
If you set static addresses on the DNS-323 and the PC and the network portion (the 192.168.x) do not match, then the devices will be on different "subnets" and will be unable to communicate with one another.
If you do not have a static address set on the DNS-323 it will default to 192.168.0.32 and you will need to set a static address in the 192.168.0.x network range to communicate with it - if you do not have a static address set on the PC, it will, in most cases, use a process known as APIPA to get a randomly selected address in the 169.254.x.y network range.