Wi-Fi Stopped Working: A Complete Guide to Diagnosing and Troubleshooting

You turned on your laptop, smartphone, or smart TV, and instead of the usual Wi-Fi connection, you see a message saying "No internet access," an endless "Obtaining IP address," or no network listed at all. This situation is familiar to everyone: according to statistics Juniper Research68% of home network users experience Wi-Fi problems at least once a month. While for some this is a minor inconvenience, for others it paralyzes work, study, or entertainment.

In this article, we won't just list trivial tips like "reboot your router" (although we'll address those properly, too). We Let's systematize all possible reasons — from hardware failures to provider errors — and we will give action algorithms Taking into account the device type (PC, smartphone, TV), router model, and even the time of day. We'll also explain why some "folk" methods, like disabling IPv6, can make the situation worse.

Spoiler: in 80% of cases, the problem can be resolved in 5-10 minutes without calling a technician. Let's start with the simplest steps and gradually move on to more complex settings.

1. Basic diagnostics: what to check first

Before messing with your router settings or calling your ISP, make sure the problem is truly with your Wi-Fi, and not with your device or external factors. Here's minimum checklist to start:

Try connecting from another device (phone/tablet)

Check the indicators on the router (is the Wi-Fi light on)

Make sure Airplane Mode is turned off on your device.

Check if your provider's plan has expired (relevant for prepaid plans) -->

If all devices If you've lost your Wi-Fi connection, the problem lies with your router or ISP. If only one device (like a laptop) isn't working, but your smartphone connects fine, look for the problem in that device's settings.

Please note router indicators:

• 🟢 Lights up green/blue — the router is turned on, but this does not guarantee that Wi-Fi is working.
• 🔴 Flashing red — critical error (overheating, firmware failure, power problems).
• 🟡 Yellow or orange — there may be problems connecting to the provider (DHCP, authorization).
• ⚫ It doesn't burn at all - check the power supply and cable.

If the Wi-Fi indicator (usually indicated by an antenna icon 📶) is not active, try turning on the wireless network using the button on the router body - on some models (TP-Link Archer C6, Asus RT-AX55) she is.

Once a week or more often

1-2 times a month

Rarely, but accurately

Never had any problems-->

2. Rebooting the router: how to do it correctly

Yes, this is the most obvious advice, but 90% of users do it wrong, which is why the problem isn't resolved. A simple reboot via the web interface or the button on the case often doesn't reset the DHCP cache and routing tables. correct algorithm:

1. Turn off the router's power (Remove the plug from the socket, do not use the button on the body!).
2. Wait 30-60 seconds - this time is enough for the capacitors to discharge and the cache to clear.
3. Turn the power back on and wait until it is fully loaded (the indicators should stabilize).
4. Restart your devicefrom which you are trying to connect (smartphone, PC).

Why does this work? A complete power outage clears temporary errors in the router firmware, renews the IP addresses from the provider (if a dynamic IP is used), and clears the ARP table cache. If Wi-Fi works after such a reboot, the problem was temporary firmware failure or IP conflict.

Still haven't helped? Let's move on to the next step. But first, check:

• 🔌 Router power supply: If you are using a surge protector or UPS, try plugging the router directly into a power outlet.
• 🌡️ Overheat: If the router case is hot, let it cool for 10-15 minutes. Modern models (Keenetic Giga, Zyxel NBG6617) automatically turn off Wi-Fi when overheated.

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

If after rebooting the router Wi-Fi still does not work, but the indicator of connection to the provider (usually indicated as WAN or Internet) If the light is yellow or red, the problem may be with your internet provider. Here's how to diagnose it:

1. Check your provider's cableDisconnect it from the router and connect it directly to your PC or laptop. If you still can't connect to the internet, the problem is definitely with your ISP.
2. Call support or check the status of services in your personal account. Some providers (Rostelecom, Beeline) have pages with information about technical work.
3. Use a backup channelIf you have a 4G router or mobile internet connection, try sharing Wi-Fi from your phone to rule out any issues with your device.

Typical problems from the provider side:

• 🔌 Cable break on line (relevant for GPON And Ethernet).
• 🔄 Authorization failed (if PPPoE, L2TP or PPTP is used).
• 📉 Traffic limit exceeded (for tariffs with restrictions).
• 🔒 MAC address blocking (if you changed the router).

If your provider has confirmed the issue, all you can do is wait. But if the problem is on your end, and your cable internet connection is working, move on to your router settings.

How do I find out what protocol my ISP uses?

Open the router's web interface (usually at 192.168.1.1 or 192.168.0.1), go to the section WAN or InternetThe connection type will be indicated there: Dynamic IP, PPPoE, L2TP etc.

4. Router settings: what could have gone wrong

If Wi-Fi isn't working but you can connect via cable, the problem lies in your wireless network settings. Access your router's web interface (the address is usually on a sticker on the bottom, for example, 192.168.1.1 or tplinklogin.net). The default login and password are also there - often it is admin/admin.

Please check the following parameters:

Pay special attention Wi-Fi channelIn apartment buildings, networks often overlap, creating interference. Use apps like Wi-Fi Analyzer (Android) or NetSpot (Windows/macOS) to find the least congested channel.

If Wi-Fi does not appear after the changes, try reset the router to factory settings (button Reset on the back panel, hold for 10-15 seconds). This will delete all your settings, including your Wi-Fi password!

5. Device issues: laptop, smartphone, TV

If your router is distributing Wi-Fi, but your device isn't connecting, check the following:

🖥️ On Windows 10/11

• 🔧 Wi-Fi adapter driver: open device Manager (keys Win + X), find Network adapters and check if there is an exclamation mark next to Wireless or Wi-FiIf there is, update the driver.
• ⚙️ Network settings: go to Settings → Network & Internet → Wi-Fi → Manage known networks, find your network and click Forget. Then reconnect.
• 🛡️ Firewall/antivirus: Disable them temporarily and try connecting again.

📱 On Android/iOS

• 🔄 Forget the network: In Wi-Fi settings, tap on your network → Forget (or Delete), then reconnect.
• 📱 Modem mode: If you use two SIM cards, try disconnecting one - sometimes this resolves conflicts.
• 🔋 Energy saving: In battery settings, turn off optimization for Wi-Fi-related apps.

📺 On Smart TV (Samsung, LG, Sony)

• 🔄 Network reset: go to Settings → Network → Reset network settings.
• 📶 Wi-Fi mode: some TVs (for example, Samsung QLED 2020–2022) do not support 5 GHz - try connecting to 2.4 GHz.
• 🕒 Software update: Check for updates in Settings → Support → Software Update.

If your device sees the network but fails to connect with an "Authentication" or "Obtaining IP Address" error, try:

1. Reboot the device.
2. Manually specify the IP address (for example, 192.168.1.100 with a mask 255.255.255.0 and a gateway 192.168.1.1).
3. Change Wi-Fi security type from WPA3 on WPA2 (some older devices do not support WPA3).

6. Hardware problems: when equipment replacement is needed

If none of the previous methods helped, the problem may be in hardwareHere are some signs that the problem is in the hardware:

• 📡 The router does not turn on (the indicators do not light even after reset).
• 🔌 Wi-Fi drops when moving the device (even over a short distance).
• 🔥 The router gets very hot or makes strange noises. (cracking, squeaking).
• 📶 The network appears and disappears cyclically (for example, every 5 minutes).

The most common hardware faults:

If the router is older than 5 years, its replacement may be justified even without obvious breakdowns: modern standards (Wi-Fi 6, Wi-Fi 6E) provide better speed and stability.

For a temporary solution you can:

• 🔄 Use your old router in standby mode repeater (if the main one works, but hits weakly).
• 📱 Share Internet from your phone (mobile hotspot).
• 🖥️ Connect via cable (if the device supports Ethernet).

How to check if your router supports Wi-Fi 6?

Look at the model number on the sticker and check the specifications on the manufacturer's website. For example, TP-Link Archer AX6000 or Asus RT-AX88U support Wi-Fi 6, and TP-Link TL-WR841N - No.

7. External interference and environmental features

Sometimes Wi-Fi doesn't work not because of the equipment, but because of external factorsHere's what can interfere with the signal:

• 🏢 Walls and ceilingsConcrete, brick, and metal weaken the signal. In apartment buildings, it's best to place the router closer to the center of the apartment.
• 📡 Neighboring networks: If there are many Wi-Fi networks on the same channel, interference occurs. Use broadcast analysis apps (Wi-Fi Analyzer).
• 🔌 Electrical appliances: microwaves, cordless phones (DECT), baby monitors operate at a frequency of 2.4 GHz and “jam” Wi-Fi.
• 🌩️ Weather conditions: During thunderstorms or heavy rain, the connection quality may deteriorate (relevant for 3G/4G routers).

How to improve the situation:

1. Change Wi-Fi channel to a less loaded one (in manual mode).
2. Switch to 5 GHz, if your devices support this range (less interference, but shorter range).
3. Use Mesh systems (For example, TP-Link Deco, Google Nest Wi-Fi) for a big house.
4. Configure QoS (Quality of Service) in the router to prioritize traffic (for example, for video calls).

If the problem only occurs at certain times of the day (for example, in the evening), it may be due to overload of the provider's networkIn this case, the following will help:

• 🔄 Manually reconnect to the router.
• 📡 Using a VPN (sometimes providers throttle traffic for certain services).

8. When to call a repairman: signs of serious problems

If you've tried all the above and your Wi-Fi still isn't working, the problem may require professional attention. Contact a professional if:

• 🔌 The router does not turn on even after resetting and checking the power supply.
• 📶 The signal disappears at regular intervals (may indicate a capacitor fault).
• 🔥 The router sparks, smokes, or smells like burning (unplug it immediately!).
• 🖥️ The same error appears on all devices (for example, DNS_PROBE_FINISHED_NXDOMAIN).

The cost of router repair depends on the fault:

Before the master's visit:

1. Take a photo of all router settings (if you have access to the web interface).
2. Check warranty - some models (Keenetic, MikroTik) have an extended warranty of up to 3 years.
3. Check with your provider to see if they are blocking your router by MAC address (this is important when replacing equipment).

FAQ: Frequently asked questions about Wi-Fi not working

🔹 Why does Wi-Fi work on my phone but not on my laptop?

This is a typical situation where the problem is device-specific. Possible causes include:

• 🔧 Wi-Fi adapter driver on your laptop is outdated or has gone wrong. Update it through device Manager.
• 🛡️ Antivirus or firewall is blocking the connection. Try temporarily disabling protection.
• ⚙️ Network settings lost. In Windows, go to Settings → Network → Wi-Fi → Manage known networks, find your network and click Forget, then reconnect.
• 🔋 Energy saving disables the Wi-Fi adapter. Device Manager open the adapter properties, go to the tab Power management and uncheck Allow the computer to turn off this device to save power.

If all else fails, try connecting your laptop to a different Wi-Fi network (for example, from your phone). If it doesn't work there either, the problem is with the laptop's adapter.

🔹 I have Wi-Fi, but the pages won't open. What should I do?

This issue is usually related to DNS settings or an IP conflict. Try the following:

1. Reboot your router (complete power outage for 30 seconds).
2. Change DNS:
   • On Windows: Settings → Network → Wi-Fi → Adapter Settings → IPv4 Properties → Specify DNS 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare).
   • On Android/iOS: In the Wi-Fi network settings, select Configure DNS → Manually.

Check your proxy settings:

• On Windows: Settings → Network → Proxy → Turn off Use a proxy server.
• On Android/iOS: In your Wi-Fi network settings, make sure the proxy is disabled.
• Disable VPN, if it is enabled.

If the pages load after changing your DNS, the issue was with your provider's DNS. If not, your provider may be blocking access (check your balance or call support).

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

If your internet speed suddenly drops, someone else may be accessing your network. Check the list of devices:

1. Go to the router's web interface (usually 192.168.1.1 or 192.168.0.1).
2. Find the section DHCP, Local area network or Wireless Network → Client List.
3. Look at the list of connected devices. Unfamiliar MAC addresses (for example, 00:1A:2B:3C:4D:5E) point to other people's devices.

To block strangers:

• Change your Wi-Fi password to a more complex one (at least 12 characters, with numbers and special characters).
• Turn on MAC filtering in the router settings and add only your devices to the whitelist.
• Turn it off WPS (This is a vulnerable protocol that can be easily hacked).

If unfamiliar devices reappear, your password may have been compromised. In this case, reset your router to factory settings and set up your network again.

🔹 Is it possible to restore Wi-Fi without a router?

Yes, there are several temporary solutions:

• 📱 Mobile hotspot: Share the Internet from your smartphone (on Android: Settings → Network & Internet → Access Point).
• 🖥️ USB modem: if you have a 4G modem (Huawei E3372, ZTE MF823), connect it to the PC.
• 🔌 Direct connectionIf your provider provides internet via cable, connect it directly to your PC (but then Wi-Fi will not work on other devices).
• 📡 Neighbor's Wi-Fi: If you have a good relationship with your neighbors, ask to temporarily connect to their network (don't forget to thank them!).

For a permanent solution without a router, you can use:

• Mesh system (For example,