Few things are more annoying than joining a multiplayer match on Windows 11 and seeing “Strict NAT” or “Unable to connect to host.” NAT type may sound like obscure router jargon, but it directly affects voice chat, matchmaking, party connections, and peer-to-peer games. The good news: you can check it in several ways and usually fix it without replacing your PC or router.
TLDR: NAT type describes how easily your Windows 11 PC can connect to other players through your router. You can check it through supported games, Xbox-related network diagnostics where available, or your router’s settings. To fix Strict NAT, enable UPnP, avoid double NAT, allow the game through Windows Firewall, and use port forwarding only when needed. If you are behind CGNAT from your internet provider, you may need to request a public IP address.
What NAT Type Means on Windows 11
NAT stands for Network Address Translation. Your router uses it to let multiple devices share one public internet address. For normal browsing, NAT works quietly in the background. For online gaming and chat, however, it can determine whether other players can reach your PC smoothly.
Most games describe NAT in three broad categories:
- Open NAT: Best case. You can connect to most players, host sessions, and use voice chat reliably.
- Moderate NAT: Usually playable, but you may have trouble connecting to some players or hosting matches.
- Strict NAT: Most restrictive. Matchmaking, parties, and peer-to-peer connections may fail or feel inconsistent.
Strict NAT does not necessarily mean your internet is slow. It means inbound connection paths are blocked, filtered, or confused by your router, firewall, ISP, or network setup.
How to Check NAT Type on Windows 11
Windows 11 does not always show NAT type in one universal place, especially on newer builds. The best method depends on the game or service you use.
1. Check NAT Type Inside the Game
Many multiplayer games show NAT status directly in their network or account settings. This is often the most accurate test because it checks the exact ports and services that game uses.
- Open the game that is having connection issues.
- Go to Settings, Account, Network, or Connection Info.
- Look for NAT Type, Connection Status, or Network Status.
- Note whether it says Open, Moderate, or Strict.
Games such as Call of Duty, Halo, and some EA or Ubisoft titles commonly include NAT information. If one game says Strict while another works fine, the issue may be game-specific ports rather than your entire network.
2. Check Xbox Networking Tools Where Available
Older Windows builds and some Microsoft gaming components include Xbox network diagnostics. If available on your system, you may find NAT-related status through Xbox apps or gaming network settings.
Try opening the Xbox app, checking its settings, or searching Windows for Xbox networking. If your version of Windows 11 no longer exposes this page, do not worry; checking inside your game is usually more useful anyway.
3. Check Your Router’s Admin Page
Your router may not label your connection as “Open” or “Strict,” but it can reveal the cause. Log in to your router by entering its gateway address in a browser, commonly 192.168.0.1 or 192.168.1.1. Look for sections such as UPnP, NAT, Port Forwarding, WAN, or Internet Status.
If your router’s WAN address is private, such as 10.x.x.x, 172.16–31.x.x, or 192.168.x.x, you may be behind another router or your ISP’s shared NAT. That can cause Strict NAT even if your own router is configured correctly.
How to Fix Strict NAT on Windows 11
1. Restart Your Network First
It sounds basic, but it works surprisingly often. Restart your PC, modem, and router. Unplug the modem and router for about 30 seconds, then reconnect the modem first. Once it is online, reconnect the router. After Windows 11 reconnects, retest NAT in your game.
2. Make Your Windows Network Private
Windows Firewall is stricter on public networks. If you are at home, set your network profile to private:
- Open Settings.
- Go to Network & internet.
- Select Wi Fi or Ethernet.
- Click your connected network.
- Choose Private network.
This does not open your NAT by itself, but it can help games and Xbox services communicate correctly.
3. Allow the Game Through Windows Firewall
A blocked game can look like a NAT problem. Open Windows Security, go to Firewall & network protection, then choose Allow an app through firewall. Make sure your game launcher and the game itself are allowed on Private networks. If you use Steam, Epic Games, Battle.net, Ubisoft Connect, or EA app, allow those launchers too.
4. Enable UPnP on Your Router
UPnP, or Universal Plug and Play, lets games request the ports they need automatically. For most home users, this is the simplest fix for Strict NAT.
- Log in to your router’s admin page.
- Find UPnP, often under Advanced, NAT, or WAN settings.
- Enable it, save changes, and restart the router.
- Restart your game and test NAT again.
If UPnP is already enabled, try disabling it, saving, rebooting, then enabling it again. Some routers need a refresh before they create new port mappings correctly.
5. Fix Double NAT
Double NAT happens when two devices are doing routing at once, such as an ISP modem-router connected to your own gaming router. Your PC then sits behind two layers of translation, which often causes Strict NAT.
Common fixes include:
- Put the ISP modem-router into bridge mode.
- Put your second router into access point mode.
- Connect your PC to the main router instead of a secondary router.
- Ask your ISP whether your connection uses CGNAT.
If your ISP uses CGNAT, your router does not receive a true public IP address. In that case, UPnP and port forwarding may not work. Ask your provider for a public IPv4 address or a gaming-friendly plan.
6. Use Port Forwarding If UPnP Fails
Port forwarding manually tells your router where to send gaming traffic. First, reserve a fixed local IP address for your Windows 11 PC in your router’s DHCP settings. Then forward the ports required by your game.
For Xbox-related multiplayer services, commonly used ports include:
- UDP: 88, 500, 3074, 3544, 4500
- TCP: 80, 3074
- TCP/UDP: 53
Other PC games may use different ports, so always check the publisher’s support page. Avoid forwarding the same port to multiple devices at the same time, because the router will not know where to send the traffic.
7. Check Teredo for Xbox Multiplayer Issues
Some Xbox services on Windows use Teredo, a tunneling technology that helps with NAT traversal. If Xbox multiplayer fails, open Command Prompt as Administrator and run:
netsh interface teredo show stateIf it reports problems, try:
netsh interface teredo set state type=clientThen restart your PC. Also make sure the IP Helper service is running by searching for Services in Windows and checking its status.
What Not to Do
Avoid placing your PC in the router’s DMZ unless you are testing briefly. It exposes the device more than necessary. Also be cautious with random “NAT fixer” apps; most simply change settings you can manage yourself. VPNs can either help or hurt depending on whether they support port forwarding, but ordinary VPNs usually make NAT stricter for gaming.
Final Thoughts
Strict NAT on Windows 11 is usually a network path problem, not a broken PC. Start by checking NAT inside the affected game, then work through the practical fixes: private network profile, firewall permissions, UPnP, double NAT removal, and port forwarding. If nothing works and your router’s WAN address is not public, your ISP may be the missing piece. Once your NAT becomes Open or Moderate, multiplayer should feel less like negotiating with a locked door and more like simply joining the game.