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About uPNP
Universal Plug and Play, abbreviated uPNP, is a media discovery service that does not require manual setup and is designed to simply work, no strings attached. uPNP offers a simple media management protocol and is built in to several services and devices that are compatible with your PlayStation 3. uPNP also handles port forwarding, which speeds up connection in certain programs by opening the connection between your computer and your device.
PS3 and uPNP
The uPNP function on the PlayStation 3 allows you to pick up on any photo, audio or video files on any computer over your uPNP-enabled network. You can access this content in the form of a DLNA media server. Some programs, such as Windows Media Player, are accessible with little to no initial setup. Other media servers can be downloaded for free online for any operating system.
Disabling uPNP
To disable uPNP on your console you'll need to redo the network setup process. Go to the Settings menu on the XMB and scroll down the "Network Settings" > "Internet Connection Settings." Initiate the setup process, and select "Custom." Follow the on-screen prompts to set up your home network. When you reach the uPNP setting, select "Disable." Finish the Internet connection prompt and test your settings.
Programs with uPNP
There are several programs designed to work with your PlayStation 3 console. The PlayStation 3 is able to see your Windows Media Player library when your computer is on and connected to the Internet. Additionally, PlayStation 3 Media Server offers a program that is not only dedicated to the PlayStation 3, but also supports transcoding unsupported file types for PlayStation 3 playback. Other media servers include Mediatomb and uShare.