Wi-Fi Error: The Network Security Key Isn't Correct — What It Means & How to Fix It

What Does This Error Mean?

This error means Windows tried to connect to a Wi-Fi network but the password you entered does not match what the router expects. It can also appear when the router changed its password or when Windows is using a saved but outdated password.

Affected Models

Windows 10
Windows 11
Windows 8.1

Common Causes

You typed the password incorrectly — Wi-Fi passwords are case-sensitive
The router's password was recently changed by someone in the household
Windows is trying to use an old saved password that no longer matches
The router was reset to factory defaults, which changes the password back to the default
Caps Lock is on, causing all letters to be entered as uppercase

How to Fix It

Check that Caps Lock is off on your keyboard. Wi-Fi passwords are case-sensitive — 'Password1' and 'password1' are completely different.

Caps Lock is the most common reason for a correctly typed password to fail.
Find your correct Wi-Fi password. Check the label on the back or bottom of your router — most routers print the default password there. It may be labeled 'Wi-Fi Password', 'WPA Key', or 'Network Key'.

If someone changed the password and you do not know the new one, you will need to reset the router.
Forget the network in Windows and try reconnecting fresh. Go to Settings > Network & Internet > Wi-Fi > Manage known networks, find your network, click Forget, then reconnect.

This clears the old saved password so Windows does not keep trying the wrong one.
View your saved Wi-Fi password on a device that is already connected. On Windows, go to Control Panel > Network and Sharing Center > click your network > Wireless Properties > Security tab > check Show characters.

Use a phone or another PC that is already connected to look up the exact password.
If you cannot recover the password, log into the router admin page (usually 192.168.1.1 or 192.168.0.1 in a browser) and change the Wi-Fi password to something new.

You will need to reconnect all your devices with the new password after changing it.

When to Call a Professional

This error almost never requires professional help. If you genuinely cannot find your Wi-Fi password and cannot access the router admin page, your ISP can help you reset the router. Call their support line — they can guide you through a router reset at no charge.

Frequently Asked Questions

Where is my Wi-Fi password printed?

Most routers have a sticker on the back or bottom. Look for labels that say 'Wi-Fi Password', 'Wireless Key', 'WPA2 Key', or 'Network Key'. The password is usually 8–20 characters long. If someone customized the password, the sticker will not show the current one.

Can I see my Wi-Fi password on my phone if I'm already connected?

Yes, on Android 10 and newer. Go to Settings > Wi-Fi, tap your connected network, and look for a QR code or 'Share' option. On iPhone, iOS 16 and newer let you tap a connected network and reveal the password. On older devices, you may need a router admin login.

What happens if I reset my router — will I lose my internet?

A factory reset wipes your custom router settings including the Wi-Fi name and password. Your internet service itself is not affected. You will need to set up the Wi-Fi name and password again, and reconnect all devices.