Windows Home Server forum published a FAQ that describe some known reasons for network connection problems with WHS and give hints, how to solve them. “When you try to install the Connector software from CD, the shared folder \\Server\Software\Home Server Connector Software or the Website http://server:55000 the server cannot be found at some point. The same can happen at a later time, if you try to open the console from the context menu of the already installed Connector. The error messages may vary, they may look like Server not found, The operation cannot be completed at this time or Password incorrect.
Full Article: WHS Forum