It's frustrating when a familiar gadget suddenly loses access to your home network or gets stuck endlessly on the "Obtaining IP Address" screen. It seems like everything was working perfectly just a minute ago, but now you're left without access to important information or entertainment. Connection problems may be caused by a simple software glitch or deeper hardware conflicts.
In most cases, there's no need to panic, as the cause lies in the router settings or the client itself. Modern network equipment TP-Link, Keenetic or Asus has complex security algorithms that sometimes block trusted devices. Understanding how wireless networks work will help you quickly identify the source of the problem.
Our task is to systematize knowledge about Why isn't WiFi working? on a specific device, and offer working diagnostic methods. We'll look at how operating system software problems Android And iOS, as well as the physical interaction of radio modules. A smart approach will save time and stress.
Software crashes and the need to reboot
The most common and often overlooked cause is a temporary failure of the operating system's network services. Over time, errors accumulate in memory, the DNS cache overflows, or the wireless adapter driver stops responding correctly to system requests. That's why the first step you should take is to perform a full system reset. reboot the device.
Many users confuse turning off the screen with a true system reboot. For proper operation, you need to completely turn off the device and turn it on again, or use the "Restart" function in the menu. This clears the RAM and restarts all system processes, including the module. Wi-Fi.
Similar steps are required for the router. A router is also a mini-computer with its own operating system, which can freeze. If your device won't connect to WiFi, but the network works on other devices, try rebooting the affected device. If the network is lost everywhere, you need to restore the router.
☑️ Basic network diagnostics
Bandwidth and compatibility issues
Modern routers often operate in two ranges: 2.4 GHz And 5 GHzOlder devices or budget smartphone models may simply not see the 5 GHz network because their antennas don't physically support this standard. If your device sees your neighbors' networks but not yours, you may be using a high-frequency network.
There's also the issue of channels. In apartment buildings, the airwaves are clogged with signals from dozens of routers. If your router is operating on a channel that's already occupied by a strong neighbor's signal, you'll experience constant disconnects or even an inability to connect. It's recommended to use WiFi analyzers to find a free channel.
⚠️ Note: Some older devices do not support the WPA3 security standard. If you recently updated your router and enabled maximum security, older devices may stop connecting. Try temporarily switching to WPA2/WPA Mixed.
It's also worth paying attention to the channel width. Setting the channel width 40 MHz or 80 MHz in the 2.4 GHz range often leads to unstable operation. For this range, the optimal and most compatible value is 20 MHz.
How to choose the best channel?
Use apps like WiFi Analyzer. Find channels 1, 6, or 11, which are the least congested by neighboring networks, and manually lock this parameter in your router settings by disabling the "Auto" function.
Password errors and saved profiles
A trivial but common mistake is an incorrect password. However, the problem may be deeper: the device is trying to connect using old saved profile, where the password has been changed by the network administrator. In this case, the gadget "thinks" it knows the password, but the router rejects its authorization attempts.
To resolve this issue, you need to perform the "Forget Network" procedure. This action deletes all saved data about a specific connection, including encryption keys and static IP addresses. After this, connecting works as if it were the first time.
- 📱 Go to WiFi settings on your device.
- 🗑️ Find the desired network in the list of saved ones.
- ❌ Click "Delete" or "Forget this network".
- 🔑 Re-enter your current password, making sure to respect the letter case.
Pay attention to your keyboard layout when entering your password. Users often accidentally turn on CapsLock or enter characters from the wrong layout (Cyrillic instead of Latin). Passwords are case-sensitive, so the letters "A" and "a" are different characters for security purposes.
IP address conflicts and DHCP settings
Each device on the network must have a unique IP addressIf two devices on your home network are assigned the same address (a static conflict), one of them will be unable to access the internet or connect to the network. Typically, the router's DHCP server is responsible for distributing addresses.
Sometimes the DHCP server gets stuck and doesn't assign a new address, or the address pool runs out (even though 254 addresses is plenty for a home). In such cases, resetting the network settings or manually assigning an IP address can help. However, manual configuration requires understanding your subnet structure.
| Parameter | Standard value | Description |
|---|---|---|
| IP address | 192.168.0.X or 192.168.1.X | Unique device number |
| Subnet mask | 255.255.255.0 | Determines the size of the network |
| Gateway | 192.168.0.1 or 1.1 | Your router's address |
| DNS | 8.8.8.8 (Google) | Domain Name Directory |
If automatic address acquisition (DHCP) isn't working, you can try setting a static IP. To do this, go to the advanced WiFi connection settings on your smartphone and select "Static" instead of "DHCP." Make sure the selected number is in the last octet group (e.g., 192.168.1).150) is not occupied by another device.
Impact of address layout (MAC filtering)
For security reasons, many administrators configure MAC filteringThis is a list of "allowed" devices that have access to the network. The MAC address is a unique identifier for the network card, programmed by the manufacturer. If your device isn't on the router's whitelist, it won't be able to connect, even with the correct password.
You can check this in the router's web interface. This section is usually located in the menu. Wireless → Wireless MAC FilteringIf the filter is set to "Allow," only devices from the list can connect. You need to find your device's MAC address (in the "About phone" or "Status" section) and add it to the router's table.
There is also a MAC address randomization feature implemented in modern versions iOS And Android To protect privacy, the device presents itself to the router under a new "fake" address each time. For a home network, it's best to disable this feature in the specific network's properties; otherwise, the router will think a new device is connecting each time.
⚠️ Note: The interfaces of routers from different manufacturers (MikroTik, Asus, Zyxel) vary significantly. The exact menu item name may vary; look for sections labeled "Filter," "Access Control," or "Wireless Security."
Physical obstacles and interference
Don't forget about the physics of radio waves. A WiFi signal, especially at 5 GHz, penetrates thick walls, mirrors, and metal structures very poorly. If you're far from the router, your device may see the network but won't be able to initiate a handshake due to the low signal strength.
Household appliances can also cause interference: microwave ovens operating at 2.4 GHz, baby monitors, wireless cameras, and even string lights with cheap controllers. If a device stops connecting at a specific time of day, it's possible that your neighbors have turned on a powerful source of interference.
To improve the situation, try moving your router higher up or closer to the center of your apartment. Using directional antennas or signal repeaters can also solve the problem of "dead zones" where connection is physically impossible.
Frequently Asked Questions (FAQ)
Why does the laptop connect but the phone doesn't?
The problem is most likely with your phone's WiFi module drivers or incompatible encryption standards. Try changing the router's security mode from WPA3 to WPA2-PSK (AES). Also, check if MAC address filtering is enabled on your router, which could block mobile devices.
What should I do if the "Obtaining IP address" light is on and nothing changes?
This indicates a DHCP server failure. Try manually entering a static IP address in the device's WiFi settings. A full router reboot with a 30-second power cycle may also help.
Can antivirus software block WiFi connections?
Yes, some aggressive firewall settings in antivirus software (such as Kaspersky or ESET) may classify a new network as "Public" and block the connection. Check your firewall settings.
How do I know if my device supports 5GHz?
Check the model's specifications on the manufacturer's official website. If the specifications indicate a standard 802.11ac or WiFi 5/6, then 5 GHz support is guaranteed. Old standards 802.11n can only operate at 2.4 GHz.