Enable or disable network discovery
If your computer is connected to a network, network policy settings might prevent you from completing these steps.
By default, Windows Firewall blocks network discovery (formerly called UPnP technology), but you can enable it.
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Open Network and Sharing Center by clicking the Start button 
, clicking Control Panel, clicking Network and Internet, and then clicking Network and Sharing Center.
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If network discovery is off, click the arrow button
to expand the section.
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Click Turn on network discovery, and then click Apply.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
