What is a Windows Firewall Exception?
In short, an exception is a port, service, or application that is allowed to receive unsolicited traffic. By default Windows Firewall blocks all outside sources from connecting to your server. However, it is useful, and sometimes necessary, to allow connections from outside sources. In these cases, you must create a Windows Firewall exception. Exceptions can be specified by program, service, port, interface, or a combination of these.
