Your Wi-Fi password is correct, but it won't work – 7 hidden reasons and how to fix it

Are you absolutely sure you're entering the correct Wi-Fi password, but your smartphone, laptop, or TV keeps showing the "Incorrect Password" or "Unable to Connect" error? This situation is familiar to millions of users, according to statistics. Juniper ResearchUp to 30% of calls to ISP support centers are related to authentication issues in wireless networks. The causes can range from a simple typo to technical issues with the router that aren't immediately obvious.

In this article we will look at all possible reasons, which can cause a device to refuse to accept the correct password—from encryption features to hardware malfunctions. You'll learn how to diagnose the problem yourself, which router settings to check first, and what to do if standard methods don't help. We'll pay special attention to hidden parameters, which even experienced users often miss: for example, why WPA3 can block old gadgets or reset MAC filter Solves the problem in 2 minutes.

For your convenience, we have compiled step-by-step instructions with illustrations from the interfaces of popular routers (TP-Link, ASUS, Keenetic, MikroTik), and also added a safety standards compatibility table. If you still have questions after reading, there's a detailed answer at the end of the article. FAQ with answers to typical scenarios.

1. Input errors: case, layout, and “invisible” characters

Let's start with the most obvious: the human factor. Even if you're sure you're entering your password correctly, 90% of cases Failed authentication is often caused by typos. This applies not only to simple letter substitutions, but also to more subtle nuances:

• 🔠 Character case: passwords WiFi_Pass123 And wifi_pass123 — these are two different sets of characters for the router. Many devices (especially Android And Smart TV) by default hides the entered characters with asterisks, which makes it easy to miss the enabled Caps Lock.
• 🌐 Keyboard layout: a classic mistake is entering a password in the English keyboard layout when it was set in Russian (or vice versa). For example, the word "password" in EN-the layout turns into gfkjmq.
• 👁️ Invisible symbols: When copying a password from a message or file, spaces, tabs, or special characters may “arrive” along with it (for example, U+200B — a non-breaking space). They are not visible, but the router perceives them as part of the password.
• 🔄 Autocorrect: Smartphones and tablets sometimes “fix” passwords automatically (for example, by replacing 0 on O or add a hyphen). Turn off autocorrect before typing!

How to check? Enter the password in text editor (For example, Notebook or Google Docs), enable the display of non-printing characters and compare with the original. For Windows this is done through File → Options → Show All Symbols.

⚠️ Attention: If you've changed the password through the router's web interface but the devices still won't connect, check to see if there's a firmware bug that prevents new settings from being applied until a reboot. Try unplugging the router for 30 seconds.

2. Incompatibility of security standards: WPA2 vs. WPA3

One of the most common reasons why the correct password does not work is conflict of encryption standardsModern routers support several authentication protocols:

• 🔒 WPA3 (the newest, safest, but not all devices support it).
• 🔓 WPA2 (universal, works on 99% of gadgets).
• ⚠️ WPA/WPA2 Mixed (hybrid mode, may cause errors).
• 🚫 WEP (outdated, unsafe - many operating systems block its use).

The problem occurs when:

1. The router is configured to WPA3, and the device (for example, old Samsung Galaxy S5 or TV LG 2016) supports only WPA2.
2. Hybrid mode is enabled WPA2/WPA3 Transition, but some devices "freeze" when selecting a protocol.
3. The provider sent a router with factory settings. WPA3, and the instructions indicate the password for WPA2 (this happens to Rostelecom And Beeline).

Solution: Go to your router settings (usually at 192.168.1.1 or 192.168.0.1) and in the section Wireless Security (or Wi-Fi Security) install:

Security standard: WPA2-PSK (AES)
Version: WPA2 Personal

3. MAC Filtering: Why Your Router Is Blocking Your Device

MAC filtering - This is a router function that allows connections only to devices with certain MAC addresses (unique network interface identifiers). If it's enabled but your smartphone or laptop isn't whitelisted, the router will reject any connection attempts—even with the correct password.

How to check:

1. Log in to the router's web interface (logins/passwords are usually on a sticker at the bottom).
2. Find the section MAC Filter, Device management or Wireless MAC Filtering.
3. Check if filtering is enabled and which addresses are allowed. If the list is empty or your device isn't there, that's the reason.

Solutions:

• 📋 Add MAC address your device to the list of allowed devices. You can find it in the network settings (Android: Settings → About phone → Status → Wi-Fi MAC address).
• 🚫 Turn off filtering, if it is not needed for security (in home networks this is unnecessary).
• 🔄 Reset settings router to factory settings if you can't find the filtering section (by pressing the button Reset for 10 seconds).

⚠️ Attention: Some providers (eg MTS or Third Transport Ring) activate MAC filtering This is enabled by default on rented routers. If you haven't configured it yourself but it's enabled, contact support and ask them to disable it.

4. Firmware failures and hardware malfunctions of the router

If the password is definitely correct, the security standards are compatible, and MAC filtering disabled - the problem may lie in software or hardware failures router. Here are typical scenarios:

• 🖥️ Broken firmwareAfter an update or a power surge, the router's firmware may have become corrupted. Symptoms: the router freezes periodically, the indicators flash erratically, and the password resets automatically.
• 🔥 Chipset overheating: If the router is operating in a closed cabinet or near a heat source, protection may be triggered, blocking connections.
• 🔌 Antenna malfunction: Physical damage to the antenna or connector means that the router does not “hear” devices at a large distance, but shows them in the list of connected devices.
• ⚡ Power surges: After a thunderstorm or power outage, the router settings may be partially reset (for example, the old network name remains, but the password is reset).

Diagnostics:

1. Check it out router logs (chapter System Log or Event log). Look for errors like Authentication failed or WPA handshake timeout.
2. Connect the router to a different power source (rule out problems with the power supply).
3. Try connecting to the router via cable (LAN) - if this doesn’t work either, the problem is definitely in the firmware or hardware.

Solutions:

• 🔄 Reset your router to factory settings (button Reset for 10–15 seconds). After the reset, the network name and password will return to the factory settings (indicated on the router sticker).
• 📥 Update the firmware manually. Download the latest version from the manufacturer's website (for example, for TP-Link Archer C6 - With tp-link.com) and download through the section Firmware Upgrade.
• 🛠️ Check the capacitors On the router's board (if you're familiar with electronics). Swollen capacitors are a common cause of unstable operation.

5. IP address and DHCP conflicts

Less often, but accurately: the problem may be related to local network settingsIf two devices on the network have the same IP address, or the router does not issue addresses automatically (DHCP disabled), connecting to Wi-Fi will be impossible - even with the correct password.

Signs of an IP conflict:

• The device "connects" to the network, but the Internet does not work.
• Your gadget appears and disappears from the list of connected devices on the router.
• Error like "IP address already in use" or "Self-assigned IP" (on Mac or iPhone).

How to fix:

1. On the device that does not connect, set IP manually:
   • For Windows: Control Panel → Network Connections → Properties → Internet Protocol Version 4 (TCP/IPv4).
   • For Android: hold your finger on the Wi-Fi network → Change Network → Advanced → IP Settings (Static).

Please enter the address like 192.168.1.X (Where X — a number from 10 to 100, not used by other devices).

⚠️ Attention: If you have devices on your network with static IP (For example, NAS, IP cameras or printers), make sure their addresses are not in the range DHCPOtherwise, the router may assign the same address to another device, causing a conflict.

6. External interference and attacks on the network

Few people think about it, but external factors They can also block Wi-Fi connections—even if the password is correct. These include:

• 📡 Channel congestion: If too many devices are connected to the router (more than 20-30), it may refuse new connections. This is especially true for budget models (TP-Link TL-WR840N, D-Link DIR-300).
• 🛡️ DDoS attacks: if someone is deliberately overloading your router with requests (for example, through a vulnerability in UPnP), it can block legitimate devices.
• 🔍 Neighboring networks with the same name: if the neighbor has a network with the same SSID (name), your device may try to connect to it and receive a password error.
• 📶 Interference from other devices: microwaves, cordless phones DECT, or even Bluetooth speakers can create noise at a frequency 2.4 GHz, interfering with the connection.

How to diagnose:

1. Check it out list of connected devices in the router. If there are a lot of strangers there MAC addresses — your network could have been hacked.
2. Change it Wi-Fi channel in the router settings (section Wireless). For 2.4 GHz Select channels 1, 6 or 11 (they do not overlap). For 5 GHz - any free one.
3. Temporarily disable encryption (install Open Network (without a password) and check if the device connects. If so, the problem is definitely with the security settings.

Solutions:

• 🔄 Change the network name (SSID) to unique (not HOME-1234 or TP-Link_XXXX).
• 🔒 Turn on protection from Brute Force (if available in the router settings).
• 📵 Turn it off WPS - This protocol is vulnerable and can be used for attacks.
• 🛡️ Update the firmware — many vulnerabilities are fixed in new versions.

7. Device Features: Why Your Smartphone/Laptop/TV Won't Connect

Sometimes the problem is not in the router, but in the device itself, which refuses to connect. Let's look at typical cases for different gadgets:

net stop WlanSvc & net start WlanSvc

For Windows It is also useful to run commands in Command line (as administrator):

netsh winsock reset
netsh int ip reset
ipconfig /flushdns

⚠️ Attention: On some devices (eg. Xiaomi or Realme) there is a bug where they don't connect to networks with Cyrillic characters in the name (SSID). Rename the network to Latin.

FAQ: Frequently Asked Questions About Wi-Fi Password Issues