WiFi Keeps Asking for Password? How to Fix Authentication Errors

You type in the correct WiFi password — you’re sure of it — and yet your device either keeps asking again or shows an “Authentication Error” message. This frustrating loop has a handful of well-known causes, and most of them are easy to fix without any technical expertise. Here’s how to diagnose and resolve WiFi authentication problems on Windows and Android, plus a few router-side checks that often get overlooked.

Why Does WiFi Keep Asking for the Password?

Authentication is the handshake between your device and the router that verifies you’re allowed on the network. When that handshake fails repeatedly, your device keeps prompting you to try again. The underlying causes fall into a few categories:

• Wrong or mistyped password — The most common cause by far. A single incorrect character triggers an immediate rejection.
• Corrupted saved network profile — Your device cached an old or broken credential set and won’t let go of it, even after you re-enter the correct password.
• Security protocol mismatch — Your router is set to WPA3-only, but an older device only supports WPA2. The handshake fails before a password is even checked.
• IP address conflict or DHCP failure — The router can’t assign your device an IP address, so the connection never completes. This sometimes surfaces as an authentication error.
• MAC address filtering — The router is configured to block any device not on its approved list, regardless of whether the password is correct.
• Outdated drivers or OS — Old network adapter drivers on Windows or an outdated Android version can introduce WiFi stack bugs that break authentication.
• Router firmware update — A firmware update can reset security settings or change the encryption mode, causing every saved device profile to become invalid overnight.

Fix 1: Forget the Network and Reconnect Fresh

This is the single most effective first step on any device. A corrupted saved profile will keep failing no matter how many times you re-enter the password — the device never actually tries your new input if it’s stuck on a cached bad credential.

On Windows 10/11

1. Go to Settings → Network & Internet → WiFi → Manage known networks.
2. Find your network and click Forget.
3. Click the WiFi icon in the taskbar, select your network, and connect as if it were new.

On Android

1. Go to Settings → WiFi, tap and hold your network name (or tap the gear icon next to it).
2. Select Forget (or “Forget network”).
3. Reconnect and re-enter the password carefully — check that caps lock isn’t on.

Fix 2: Restart Your Router

A router reboot clears its memory, restarts the DHCP server (which assigns IP addresses), and resets any temporary states that might be blocking authentication. Unplug the router from power, wait 30 seconds, then plug it back in. Wait 2–3 minutes for it to fully come back up before trying to connect.

If the problem started right after a firmware update, log into the router admin panel (typically at 192.168.1.1) and verify that the SSID, password, and security mode (WPA2/WPA3) are still set correctly — firmware updates can revert these to factory defaults.

Fix 3: Check the Router’s Security Mode

An encryption mismatch is a silent killer. A router set to WPA3 only will reject any device that only supports WPA2, and the error message rarely explains why. The safest setting for most home networks is WPA2/WPA3 mixed mode — it provides strong security while maintaining backward compatibility.

In your router admin panel, navigate to the wireless settings section and look for “Security Mode” or “Authentication.” Avoid WEP and WPA-TKIP — these are outdated protocols that modern devices actively reject. Use WPA2-AES or WPA2/WPA3-AES instead. For more on WiFi security standards, see our guide on WPA2 vs WPA3.

Fix 4: Check MAC Address Filtering

MAC address filtering is a router feature that creates an approved list of devices. Any device not on the list is blocked, even with the correct password. It’s rarely enabled by default, but if someone in your household turned it on or a firmware update reset settings oddly, it can cause exactly this symptom.

In your router admin panel, look for MAC Filtering under Wireless or Security settings. Either disable it entirely (recommended for most home users) or add the MAC address of your device to the approved list. You can find your device’s MAC address in Windows under Settings → Network & Internet → WiFi → Hardware Properties, or on Android under Settings → About phone → Status → WiFi MAC address.

Fix 5: Update Network Adapter Drivers (Windows)

Outdated WiFi drivers can cause authentication failures, especially when a router firmware update introduces support for a newer security protocol. To update:

1. Right-click the Start button and open Device Manager.
2. Expand Network Adapters and right-click your WiFi adapter.
3. Select Update driver → Search automatically for drivers.
4. Alternatively, visit your laptop manufacturer’s website and download the latest WiFi driver directly.

If updating doesn’t help, try uninstalling the driver (check “Delete the driver software”) and restarting Windows — it will reinstall a clean copy automatically.

Fix 6: Switch Android from DHCP to a Static IP

If your Android device connects but immediately disconnects or shows an authentication error after a moment, the cause is often a DHCP failure — the router can’t assign your phone an IP address. Bypassing DHCP with a static IP often fixes it:

1. Go to Settings → WiFi, tap the gear icon next to your network.
2. Tap Advanced (or expand the Advanced section).
3. Change IP Settings from DHCP to Static.
4. Enter an IP address like 192.168.1.100 (or any unused address in your router’s range), subnet mask 255.255.255.0, and gateway matching your router’s IP (usually 192.168.1.1).

Fix 7: Verify Date and Time (Windows)

This fix sounds odd, but an incorrect system clock breaks certificate-based authentication on some networks. If your PC’s clock is significantly off, enterprise-style security handshakes will fail. Go to Settings → Time & Language → Date & time and enable Set time automatically.

Last Resort: Full Network Reset

If none of the above resolves the issue, a full network reset wipes all saved WiFi profiles and reinstalls the network stack from scratch. On Windows, go to Settings → Network & Internet → Advanced network settings → Network reset and click Reset now. On Android, go to Settings → General Management → Reset → Reset Network Settings. You’ll need to reconnect to all your saved networks afterward.

The Bottom Line

A WiFi password loop is almost always caused by one of three things: a corrupted saved profile, a security protocol mismatch, or a DHCP failure. Start by forgetting the network and reconnecting fresh, then check your router’s security mode settings. If you’re seeing slow speeds after resolving the authentication issue, run a speed test to see what you’re actually getting. For persistent WiFi problems, our guide on WiFi keeps disconnecting covers additional advanced fixes.