Hi,
let's start with the basics - did it ever work on that server?
Can you use Internet Explorer on the server desktop to browse to microsoft.com or to any other website?
If not, you would have to verify, what is wrong with your network - if only microsoft.com does not work, your machine may be infected with malware.
Is there something special in your home network configuration (i.e. cascaded routers)?
Did you install any security software on your server (which may sometimes block valid stuff as well)? If so try to uninstall it.
Best greetings from Germany
Olaf