Mac Wi-Fi problems range from simple (wrong password) to complex (corrupted network preferences). This guide covers the full range of fixes.
Quick Fixes (Try These First)
- Turn Wi-Fi off, wait 10 seconds, turn back on.
- Restart your Mac.
- Restart your router (unplug 30 seconds).
- Move closer to the router.
Medium Fixes
- Forget and rejoin network: System Settings > Wi-Fi > (i) next to network > Forget Network. Reconnect and re-enter password.
- Renew DHCP lease: System Settings > Network > Wi-Fi > Details > TCP/IP > Renew DHCP Lease.
- Change DNS servers: System Settings > Network > Wi-Fi > Details > DNS > Add 1.1.1.1 and 8.8.8.8.
- Flush DNS cache:
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder - Disable VPN and proxy: VPNs can interfere. Disconnect your VPN and check System Settings > Network > Proxies (should all be unchecked).
Advanced Fixes
- Reset network preferences: Delete these files (requires admin, Mac will recreate them on restart):
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist
/Library/Preferences/SystemConfiguration/com.apple.network.identification.plist
/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist - Run Wireless Diagnostics: Hold Option key, click Wi-Fi icon, "Open Wireless Diagnostics." Provides automated analysis and log capture.
- Check for interference: Wireless Diagnostics > Window > Scan to see nearby networks and channel congestion. Change your router to a less congested channel.
People Also Ask
- How do I reset the Wi-Fi on a Mac?
- The quickest reset is to forget the network and delete network preferences files. For a full network stack reset, use the Network Reset option under System Settings > General > Transfer or Reset > Reset Network Settings (macOS Sequoia and later).
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