The following procedure presumes that you are using the firewall delivered by Microsoft Windows. If you are using third-party firewall software, please consult that product's documentation. You need to open inbound port 8081.
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Select Start > Settings.
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Search for and open Windows Firewall.
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On the left, select Advanced settings.
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On the left, select Inbound Rules.
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On the right, select New Rule....
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Select Port, and select Next.
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Select TCP.
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Select Specific local port, and then type 8081.
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Select Next.
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Select Allow the connection, and select Next.
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Clear the Public checkbox, and select Next.
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Type Smart 3D Name Generator Service in the Name box, and then select Finish.