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. If your network location is set to Home or Work, Remote Assistance should automatically set up the necessary firewall settings.
Open Windows Firewall by clicking the Start button , and then clicking Control Panel. In the search box, type firewall, and then click Windows Firewall.
In the left pane, click Allow a program or feature through Windows Firewall.
Click Change settings.
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
Under Allowed programs and features, select the check box next to Remote Assistance, and then click OK.
If you use a different firewall, follow the instructions that came with your firewall software.