Router configuration required - Firewall is blocking (customer's computer and the router firewall)
This error will appear if the software has detected a firewall on your computer or router, and the firewall is preventing other computers from accessing your own computer.
To learn more about what firewalls are and how they work, please click here.
The default firewall that comes with your computer is called the Windows Firewall. You can learn how to modify it by reading the following Microsoft knowledge base article:
You may have a different firewall running though, such as a different software-based firewall, or a firewall that comes installed on your router. To learn how to modify these third party firewalls, please click here for more information.
If you cannot find a reference to the firewall that you are using, you may have to check if your firewall comes with help documentation, or you can alternatively search the Internet for a help guide.