Why Wi-Fi isn't working: a complete diagnosis and troubleshooting guide

You're trying to connect to Wi-Fi, but the network keeps dropping out or not showing up at all. Or you're connected, but pages won't load, and videos are constantly buffering. Sound familiar? Having trouble with wireless Internet There are dozens of possible causes, from a simple router malfunction to hidden provider settings. In this article, we'll look at all possible scenarios, Why Wi-Fi isn't working, and we will give clear instructions on how to restore a stable signal.

It's important to understand: if the internet is lost on only one device (for example, a smartphone), while everything works on the others, the problem is most likely with the gadget. If the network is unavailable on everyone If the problem persists on multiple devices simultaneously, the router, cable, or ISP is to blame. We've structured this article so you can quickly find a solution for your situation—from the simplest steps to in-depth hardware setup.

Don't rush to call support or buy a new router. In 80% of cases, problems can be resolved in 5-10 minutes using the standard methods we've described below. And if you need help with a specific router model (for example, TP-Link Archer C6 or Keenetic Ultra) - pay attention to the blocks with technical details.

1. Check the obvious: the router is turned on, the cables are connected

It sounds trivial, but a third of service provider support requests are resolved at this stage. Before digging deeper, make sure:

• 🔌 The router is connected to the outlet and power indicator The light is on (usually green or blue). If the light is blinking red or not lit at all, check the power supply and cable.
• 🌐 Cable from the provider (usually WAN or Internet) is firmly inserted into the corresponding port on the router. It is distinguished by its color (usually blue) and label.
• 📶 Button Wi-Fi on the router body is not disabled (relevant for models with a physical switch, for example, ASUS RT-AX88U).

If the router doesn't respond to the power button, try a different power supply (from a laptop or phone with a similar connector). Sometimes the problem lies in a burned-out adapter, especially if the device has been exposed to power surges for a long time.

⚠️ Attention: On some routers (for example, Zyxel Keenetic) The Wi-Fi indicator may remain lit even when the network is disconnected. Check the connection status in the web interface or through the manufacturer's mobile app.

2. Rebooting the router and devices: why it works

The most universal advice from IT specialists—"turn it off and then turn it back on"—works here too. Restarting the router clears temporary errors. DHCP, clears the cache DNS and reinitializes the wireless module. Here's how to do it correctly:

1. Unplug the router from the power outlet (do not use the power button - this is not a hard reset!).
2. Wait 30–60 seconds - this time is enough for the capacitors to discharge.
3. Connect the power back and wait until it boots up completely (all indicators should stabilize).
4. Restart the device on which Wi-Fi is not working (phone, laptop, Smart TV).

If after rebooting the network appears, but after some time it disappears again, the problem may be in router overheating or unstable power supply. Check whether the device is located in an enclosed space (such as a cabinet) or near heat sources.

3. Problems on the provider's side: how to check

If Wi-Fi is not working on any device and the indicator Internet If the router light is off or flashing orange, it's your ISP's fault. Possible causes:

• 🔧 Technical work on the line (scheduled or emergency).
• 💰 Unpaid bill (some providers block access without warning).
• 📡 Damage to cable on the street or in the entrance.
• 🛠️ Failure on the provider's equipment (for example, on BRAS server).

How to diagnose:

1. Check if the indicator light is on WAN/Internet on the router. If not, the problem is definitely with the ISP.
2. Connect the cable directly to the computer (into the port Ethernet). If the Internet doesn't work, it's the provider's fault.
3. Call support or check the service status in your personal account. Some providers (for example, Rostelecom or MTS) display information about accidents on the site.

⚠️ Attention: If you have dynamic IP, and the router can't get an address for a long time - try manually setting a static IP in the settings WANPlease check with your provider for current parameters.

4. Router settings: reset and basic configuration

If rebooting doesn't help, the next step is to reset the router to factory settings. This will fix errors caused by incorrect parameter changes. How to do it hard reset:

1. Press and hold the button Reset (usually recessed into the body and requires a paper clip) within 10-15 seconds.
2. Wait until the router completely reboots (all indicators will go out and then light up again).
3. Connect to the Wi-Fi network with the default name (indicated on the router sticker) and set up your Internet connection again.

After the reset you will need:

• 🔑 Enter your provider's login and password (specified in the contract).
• 📡 Set up a network name (SSID) and Wi-Fi password.
• 🔒 Update your router firmware (relevant for older models).

If you don't remember your ISP connection details, you can find them here:

• In the contract for the provision of services.
• In your personal account on the provider's website.
• On the sticker on the back of the router (if it was issued by the provider).

5. Channel conflicts and network congestion

If Wi-Fi works, but constantly breaks off or slows down — The problem may be channel congestion. In apartment buildings, neighboring routers' networks often overlap, creating interference. How to check and fix this:

1. Install a Wi-Fi analysis app on your smartphone (for example, WiFi Analyzer For Android or NetSpot For iOS).
2. Check out what channels (1–13 for 2.4 GHz) are less loaded.
3. Log into your router settings (usually at 192.168.1.1 or 192.168.0.1) and change the channel in the section Wireless.

For the network 5 GHz select channels with numbers 36–48 or 149–165 — they are less susceptible to interference. If your router supports 160 MHz, but the network is unstable, try reducing the channel width to 80 MHz or 40 MHz.

What are DFS channels in 5 GHz?

DFS channels (50–144) are used by radar and weather services. The router can automatically switch from these channels if it detects interference, which can cause brief connection interruptions. If stability is more important than speed, choose a fixed channel outside the DFS range.

Another common problem is network congestion a large number of connected devices. Modern routers support up to 250+ connections, but in practice already 20–30 Active gadgets can slow down the network. Check the list of connected devices in the router settings (section DHCP or Connected Devices) and disable unknown ones.

6. Device problems: phone, laptop, Smart TV

If Wi-Fi isn't working on just one device, but the others connect fine, the problem is with that device. Let's look at some typical scenarios:

📱 Smartphone (Android/iOS)

• 🔄 Switch to airplane mode for 10 seconds, then turn it off.
• 📵 Forget the network (Settings → Wi-Fi → [tap on the network] → Forget) and reconnect.
• 🔧 Reset network settings (Settings → General → Reset → Reset network settings).
• 📱 Update your device's firmware (sometimes bugs in Wi-Fi drivers are fixed in updates).

💻Laptop (Windows/macOS)

• 🔧 Disable and re-enable your Wi-Fi adapter in Device Manager (For Windows).
• 🔄 Run the commands in Command line (as administrator):

  netsh winsock reset
  netsh int ip reset
  ipconfig /flushdns

• 🔒 Check if your antivirus or firewall is blocking the connection.
• 📡 Update your Wi-Fi adapter driver via device Manager.

📺 Smart TV or set-top box

• 🔄 Restart the device (unplug from the socket for 1 minute).
• 📵 Remove the network from your saved connections and reconnect.
• 🔧 Reset network settings to factory defaults (Settings → Network → Reset).
• 📡 If the TV is old (for example, Samsung Series 5 2015), try connecting via cable - Wi-Fi modules in earlier models often do not support modern standards.

⚠️ Attention: On some Smart TV (For example, LG WebOS) After resetting the network, you may need to reactivate services (for example, Netflix or YouTube). Save your account details in advance.

7. Hardware malfunctions: when repairs are essential

If none of the previous methods helped, it is possible hardware failure router or device. Typical signs:

• 🔌 The router does not turn on even after replacing the power supply.
• 📡 The Wi-Fi indicator does not light, although the router is working (problem with the wireless module).
• 🔥 The router body gets very hot and smells like burning.
• 📱 Wi-Fi turns on on the device, but it doesn’t find any networks (the adapter is broken).

What to do:

• If your router is broken, check if it's still under warranty. Many manufacturers (TP-Link, ASUS) give 2–3 years guarantees.
• If the problem is with the device (laptop, phone), try connecting USB Wi-Fi adapter (costs from 500 ₽).
• If the router is older 5 years — it’s easier to buy a new one. Modern models (for example, Xiaomi AX3000) support Wi-Fi 6 and work more stably.

A critical sign of a faulty router: if the internet works when connected via cable (Ethernet), but not via Wi-Fi, the problem is definitely with the router's wireless module. In this case, repairs are often uneconomical—it's cheaper to buy a new model.

8. Additional diagnostic methods

If standard methods don't work, try these advanced techniques:

• 🔍 Ping test: Open Command line (Win + R → cmd) and run:

  ping 8.8.8.8 -t

  If the packets do not pass (The specified node is unavailable) — a problem with your ISP connection. If you have ping, but websites don't open, it's your ISP's fault. DNS.

• 📡 Changing DNS: In the router or device settings, replace the provider's DNS with 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare).
• 🔧 Disabling IPv6: If the provider does not support IPv6, but it's enabled in the router settings, which can cause conflicts. Disable it in the section LAN or WAN.
• 🛡️ Virus check: Some malware (eg. Trojan.DNSChanger) change network settings. Scan your device with an antivirus.

If you suspect the problem is router firmware, try updating it manually:

1. Download the latest firmware version from the manufacturer's official website.
2. Log into the router's web interface and find the section Software update or Firmware Upgrade.
3. Download the firmware file and wait for the process to complete (do not turn off the power!).

⚠️ Attention: Some router models (for example, D-Link DIR-300) If a firmware update fails, your device will become bricked. If you're unsure, contact a specialist.

FAQ: Frequently asked questions about Wi-Fi not working

🔹 Why is Wi-Fi working but there's no internet (exclamation mark on the network icon)?

This means the device is connected to the router, but it can't access the internet. Reasons:

• Incorrect settings WAN (provider login/password).
• Provider side failure (check the indicator) Internet on the router).
• Blocking by MAC address (relevant for some providers, for example, Beeline).

Solution: Reboot your router and check your settings. WAN, call your provider.

🔹 Why does Wi-Fi disappear after my laptop sleep/hibernates?

This is a typical Wi-Fi adapter driver issue. Windows or macOS may "forget" the network after waking up. Here's how to fix it:

• Update your adapter driver via device Manager.
• Disable power saving mode for Wi-Fi in Power Settings.
• IN Control Panel → Network and Internet → Change adapter settings Turn your wireless connection off and on again.

🔹 How do I find out who is connected to my Wi-Fi?

The list of connected devices can be viewed:

• In the router's web interface (section DHCP Clients, Connected Devices or Wireless).
• Through the manufacturer's mobile application (for example, TP-Link Tether or Mi WiFi).
• Using third-party programs, for example, Wireless Network Watcher (For Windows).

If you find unknown devices, change your Wi-Fi password and enable filtering by MAC addresses.

🔹 Why does Wi-Fi only work near the router?

A weak signal may be caused by:

• Low router transmission power (check settings) Transmit Power - install on 100%).
• Interference from other networks or household appliances (microwaves, cordless phones).
• Inappropriate placement of the router (in a corner, behind furniture, in a closet).
• Outdated Wi-Fi standard (eg. 802.11n instead of 802.11ac).

Solution: Move the router to the center of the apartment, change the channel, install repeater or Mesh system.

🔹 Can antivirus software block Wi-Fi?

Yes, some antiviruses (for example, Kaspersky Internet Security or Avast) have a built-in firewall that can block network connections. Check:

• Antivirus firewall settings (section Net or Firewall).
• Exceptions for your Wi-Fi network.
• Blocking log (your antivirus may consider your router "suspicious").

Temporarily disabling your antivirus will help confirm the program's culpability.