At a basic level, UPnP allows devices to discover each other on the same network dynamically so that all devices can communicate with each other for data sharing and entertainment purposes. Quick Tangent: While UPnP is a great idea to make home networking easier, it opens up the inside resources to many potential attacks. The following is my configuration setup to fix my Xbox One as well as other gaming consoles which need Universal Plug and Play (UPnP).
A 1-to-1 static NAT mapping must be created to forward the appropriate ports to the console from the Xbox Live service or PSN. Requests from a console via uPnP to open ports will be ignored by the firewall. Palo Alto Networks firewalls are not compatible with uPnP. In a uPnP environment, the console will request the appropriate ports be forwarded to allow the traffic. uPnP-enabled routers allow port forwarding to be configured on the device dynamically based on requests coming from internal devices. The consoles are compatible with uPnP devices to allow dynamic opening of TCP and UDP ports to forward traffic required for connectivity to the service. If these inbound connections can not be established then the console will report that strict NAT has been detected. When hosting some games, or using some applications, a connection from the Xbox Live service or PlayStation Network inbound to the console is required. When connecting to the Xbox Live service or PlayStation Network the console establishes client connections to the service.
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