Newbie questions

If you have connected devices that need to discover each other then UPnP may need to be enabled. It is likely you do not as this is actually a rarer case then it used to be.  If you do not need it then disable it as it is a potential security hole.   I had UPnP enabled on my R7000 and had frequent remote access intrusions.

From

http://www.makeuseof.com/tag/what-is-upnp-and-why-is-it-dangerous-makeuseof-explains/

• Programming Errors – there are oversights in the actual code for UPnP implementations that can be exploited by malicious users, allowing them to execute harmful code through injection.
• Unintended Exposure – the purpose of UPnP is to make devices on a network easily discoverable by other devices on that network. Unfortunately some UPnP control interfaces can be (and routinely are) exposed to the public Internet, allowing malicious users to find and gain access to your private devices