Wired vs. Wireless: Use Ethernet if possible. If Wi-Fi, ensure 5GHz band, close proximity, minimal interference.
NAT Type: Aim for Open. If Strict/Moderate: Enable UPnP on router, set static IP + port forwarding (TCP/UDP 3074, 53, 80, 500, 3544, 4500), or use DMZ (last resort).
DNS: Try Google (8.8.8.8 / 8.8.4.4) or Cloudflare (1.1.1.1) in console network settings.
Clear Alternate MAC:Settings > General > Network settings > Advanced settings > Alternate MAC address > Clear.
Check for Console Updates: Offline update via USB if no connection at all.
Contact Support:Xbox Support (chat, callback, schedule) if hardware issue suspected.