What Is UPnP? Should You Turn It On or Off?

Should you turn UPnP on?

• Turn it on if you game online, use consoles or need apps like Plex to work remotely, and you keep devices updated.
• Turn it off if you have many smart gadgets, cannot update firmware, or prefer manual port forwarding.
• Middle ground: turn it off and forward only the ports you need.

When a console is in the house, I leave UPnP on and keep the firmware current.

How UPnP works, in one minute

Normally your router blocks unsolicited connections from the internet. Some apps, like games and voice chat, need incoming connections to work properly. UPnP lets those apps ask the router to open a port automatically, instead of you setting up port forwarding by hand.

The catch is that any program on your network can make that request, including malware. That’s the main argument against leaving it on. I treat that open-door risk as the real price of the convenience.

Gaming consoles and UPnP

Xbox, PlayStation and Nintendo Switch all work better with UPnP on. Without it, you may see a strict or moderate NAT type, trouble joining parties and voice chat problems.

• If you play online a lot, leave UPnP on and keep your devices updated.
• If you’re security-minded, turn UPnP off and set manual port forwarding for your console’s ports.
• Avoid double NAT, which breaks UPnP even when it’s enabled.

A strict NAT type on a console is the symptom I trace back to UPnP first.

UPnP and smart-home devices

It isn’t just games that use UPnP. Media servers like Plex, some security cameras, VoIP phones and smart-home hubs may try to open ports automatically for remote access. That can be convenient, but it also means devices you rarely think about could be reachable from the internet.

Most routers list active UPnP mappings on their UPnP page. Check it occasionally. If you see a device you don’t expect, find out why it needs an open port, and turn off its remote access feature if you don’t use it.

The forgotten camera is the device I find most often when I check those mappings.

A balanced UPnP setup

• Keep router firmware and device software updated.
• Leave UPnP on only if you have consoles or apps that need it.
• Turn off remote features on cameras and NAS boxes you don’t access from outside.
• Consider putting smart devices on a guest or IoT network.
• Review active UPnP mappings every few months.

The every-few-months review is the habit I keep even when everything works fine.