Does it do this when you try to access the share using the unc name (eg click on Start and then type either \ServerName or \serverName\shareName)
On my system, when I double click on Computer and then select Network on the left hand panel, I see a list of all my networked devices. For one of these computers it shows up twice. Once under the list of computers and then again under 'Other Devices'. The name on both devices is the same (ie the server name). The first icon will access the file share as normal, whereas the second is some sort of UPNP detection and displays a webpage which tells me a bit about the device and also gives me a link to download some software to backup my machine to the server.
Is it possible you are trying to access the server via some icon like this? If it is, then when you right click on the icon. I think you will get a 'View Device Webpage' option on the menu, rather than the normal 'Open'.