Unable to connect to a server at XXX.XXX.XXX.XXX on port 80 (socket code 10051)
You may get this message if your ISP is using a proxy server.
Call your ISP and get their proxy server information. Once you have that information do the following:
Open your web in FrontPage Explorer.
Click on Tools.
Click on Options.
Click on Proxies.
Enter the proxy information (generally this is the proxy machine name and port #; an example might be proxy.domain.net:8080)