Issue Description
Wi-Fi shows Authentication error and won’t connect.
Common Causes
Incorrect password
Router encryption mismatch
Saved network conflict
Step-by-Step Solution
Step 1: Forget and Reconnect Network
Settings → Wi-Fi → Network → Forget
Re-enter password carefully
Step 2: Restart Router and Phone
Refreshes authentication handshake
Step 3: Change Router Security
Set encryption to WPA2-PSK (if possible)
Step 4: Reset Network Settings
Clears saved credentials
Explore Further
Test with another Wi-Fi network
Prevention & Best Practices
Avoid auto-connect to unstable networks.