Allow Windows Remote Assistance to communicate through a firewall
Because firewalls can restrict communication between your computer and the Internet, you might need to change firewall settings in order to use Windows Remote Assistance.
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Open Windows Firewall by clicking the Start button
, clicking Control Panel, clicking Security, and then clicking Windows Firewall.
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Click Allow a program through Windows Firewall.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
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Under Program or port, select the check box next to Remote Assistance, and then click OK.