In order to fix the issue, go to Start, type Windows Firewall and open the utility. After that, open the Allow a program or feature through Windows Firewall option and check the box next to Sabre View. After that, click OK and open the Advanced Settings option. Select Inbound Rules, click New Rule, check the Port box, click Next, select All local ports, click again Next and follow the on-screen instructions. If the issue persists, try uninstalling and then reinstalling the software.