Windows Firewall will often block Windows 8 applications from working properly. You can solve this problem by adding an exception and allowing the program to bypass the firewall restrictions.
Step 1. Locate the Windows Firewall from the Windows 8 Start menu
Go to the "Settings" section.
Step 2. Choose to view the Windows Firewall options that appear in the upper left corner
Step 3. Click on the "Allow an App or Feature Through Windows Firewall" button in the Windows Firewall window
Step 4. In the next window, click on the Change settings button
Click on the "Allow another app …" button in the lower right corner.