To open ports on the firewall, go to the Start > Control Panel.In the Control Panel, click on the Windows Firewall.In the Windows Firewall, go to the Exceptions tab and click on the Add Port button.The Add a Port dialog appears. Enter a name for the exception ( Fax Server in this case ) and enter the port number ( 1171-1173 for the Impact Fax Server or 3710 for the Print Monitoring Server ) Make sure the TCP radio button is selected and click on the OK button to apply the changes.The Fax Server item is now added. To open multiple ports for the Impact Fax Server repeat the Add Port process. Thank you for using Impact Fax Server. Click here to see more tutorials.