Issue Description
iPhone shows authentication error and fails to connect to Wi-Fi.
Common Causes
Incorrect password
Router encryption mismatch
Saved network conflict
Step-by-Step Solution
Step 1: Forget Wi-Fi Network
Settings → Wi-Fi → Network → Forget This Network
Step 2: Restart Router and iPhone
Refreshes authentication handshake
Step 3: Re-enter Wi-Fi Password
Ensure correct case and characters
Step 4: Reset Network Settings
Fixes persistent authentication errors
Explore Further
Change router security to WPA2 if needed
Prevention & Best Practices
Avoid auto-connecting to unstable networks.