If you are experiencing problems with the Universal Plug and Play service, your computer might not be able to automatically detect the presence of other networked devices, such as PCs, printers, Internet access points and so on. That is where the UPnP Test application comes in.
This simple program is designed to help you identify the issues that prevent the UPnP protocol from functioning correctly. Before you get your hopes up, you should know that this tool does not solve the detected problems, but only performs a series of tests to identify the possible causes.
One advantage is that the application does not require installation, so your system registry is not affected in any way. The interface is compact and simple, comprising only two panels: one that displays the test type and its short description and the other for viewing which of the tests passed and which failed.
The program can verify whether the operating system provides support for the UPnP service and allows you to check if the Simple Service Discovery Protocol (SSDP) and the UPnPHost services are running. It also verifies the connection between your network adapter and your router and the system's capacity to receive UPnP messages, as well as the router's capability to report an external IP address.
One of the tests is designed to check if the Windows firewall service is blocking the traffic between your router and the system, thus preventing UPnP from working.
The results can be copied to your clipboard by simply pressing a button and the tests can be redone easily. If you want to fix the detected issues, the link in the main interface can prove useful.
In conclusion, UPnP Test is a simple tool for detecting problems related to device-to-device networking. However, it can only suggest possible reasons why the UPnP is not working, fixing the detected issues is totally up to you.