Deco update may be blocking Xbox online game connections
Since June 25, 2026, an Xbox Series X can no longer connect to online game servers. Xbox services still work, and parties and apps still connect, but online games fail with a server connection error. The home setup uses a Deco AX5000 mesh router, Glofiber , and an ONT box.
The Xbox shows an open NAT type, has no UPnP error, and the connection uses a public IP, so CGNAT does not appear to be the cause. Router-side checks included turning UPnP off and on, disabling IPv6, trying both 2.4GHz and 5GHz networks, resetting all routers, resetting the ONT, and applying firmware updates, but the issue remained. The same failure happens over Ethernet, not only Wi-Fi.
Xbox-side checks included changing and clearing the , trying different ports, switching between manual and automatic DNS settings, fully restarting the console, reconnecting to the network, and signing accounts out and back in. The same Xbox works normally on both Wi-Fi and Ethernet at another house, so the console itself is unlikely to be broken.
Key points
- The issue began on June 25, 2026.
- Xbox parties and apps still work, but online game servers do not connect.
- The failure happens on both Wi-Fi and Ethernet.
- The Xbox works at another house, which points away from console hardware failure.
- Router firmware or router behavior is a likely area to investigate when only certain connections fail.