How to Fix Wi-Fi Only Working on Some Devices

When Wi-Fi works on some devices but not others, the issue usually lies in router settings, device compatibility, or network configuration conflicts. This problem commonly affects specific device types or older hardware that can't connect to certain network bands or security protocols.

1. Check which devices connect and which don't. Make a list of working and non-working devices, noting their ages and operating systems. Look for patterns like all Apple devices failing, only older devices having issues, or specific device types being affected. This information reveals whether the problem is device-specific or network-wide.
2. Restart your router and modem. Unplug both devices for 30 seconds, then plug in the modem first and wait 2 minutes. Plug in the router and wait another 2 minutes for full startup. Test the problematic devices again to see if a fresh network session resolves connection conflicts.
3. Check Wi-Fi band settings. Log into your router admin panel and navigate to wireless settings. If you have a dual-band router, check if 2.4GHz and 5GHz bands use the same network name. Older devices often can't connect to 5GHz networks, while some newer devices prefer 5GHz and struggle with mixed networks.
4. Review security protocol settings. In your router's wireless security settings, check if you're using WPA3 encryption. Change the security protocol to WPA2/WPA3 mixed mode or WPA2 only if older devices can't connect. Very old devices may require WEP, but avoid this unless absolutely necessary due to security risks.
5. Check connected device limits. Look for device limit settings in your router configuration and verify you haven't exceeded the maximum number of connected devices. Some routers limit connections to 15-20 devices, and reaching this cap prevents new devices from connecting even if others disconnect.
6. Update router firmware. Access your router's admin panel and check for firmware updates in the administration or system section. Download and install any available updates, as outdated firmware can cause compatibility issues with newer device operating systems and wireless standards.
7. Reset network settings on affected devices. On devices that can't connect, forget the Wi-Fi network and reconnect with the password. For persistent issues, reset network settings entirely: on iOS go to Settings > General > Reset > Reset Network Settings, on Android go to Settings > System > Reset > Reset Wi-Fi, mobile & Bluetooth.
8. Check for MAC address filtering. In your router settings, look for MAC address filtering or access control lists. If enabled, this feature only allows specific device MAC addresses to connect. Either disable MAC filtering or add the MAC addresses of devices that can't connect to the allowed list.