Every internet user is familiar with the situation when a device refuses to connect to their home network. The router's indicators seem to be lit, and the neighbor's Wi-Fi is working, but your device stubbornly displays "Unable to connect" or is stuck in the "Obtaining IP address" status. This is a classic failure that can be caused by a software issue in the smartphone or laptop itself, or by a problem with the access point's settings.
Before panicking and calling your ISP, it's worth running a basic diagnostic. Often, the problem can be resolved by simply rebooting the equipment or resetting the network settings on the client device. However, if standard methods don't help, it's necessary to delve deeper into security settings, frequency ranges, and network adapter drivers.
In this article, we'll explore all the possible reasons why you can't connect to your WiFi network, from a simple password error to complex MAC address conflicts. We'll walk you through steps to restore your connection on Windows, Android, and iOS using proven methods.
Initial diagnostics and equipment reboot
The first step is to rule out temporary router malfunctions. Routers, like any computer, have RAM, which can become full, causing IP address distribution services to stall. Physical reboot — this isn't just turning off the device with a button, but completely de-energizing the device for 10–15 seconds. This allows the capacitors to discharge and the cache memory to clear.
After turning on the router, wait 2-3 minutes for it to fully load the operating system and enable the wireless interfaces. The WiFi indicator should light or blink. If the connection is not restored after this, try "forgetting" the network on your device. To do this, go to WiFi settings, select your network, and tap "Delete" or "Forget," then re-enter the password.
⚠️ Caution: If the router makes strange noises, becomes very hot, or smells burnt, unplug it immediately. Continued use may cause fire or electric shock.
It's also worth checking whether the limit of connected devices has been reached. Some budget models TP-Link or D-Link may not function properly if more than 10–15 devices are connected simultaneously. In this case, disconnecting the extra devices can instantly resolve the issue.
Problems with IP addressing and DNS servers
One of the most common reasons why a laptop or phone says “Unable to obtain an IP address” is a conflict in the router’s DHCP server. DHCP Automatically assigns unique addresses to each device on the network. If the address table is full or fails, a new device cannot gain access to the network.
In this case, static IP addressing can help. You can manually enter the address in the network adapter settings. This is usually done in the IPv4 protocol properties section. You'll need to specify the IP address (e.g., 192.168.0.150), subnet mask, and gateway (router address).
IP address: 192.168.1.150Subnet mask: 255.255.255.0
Default gateway: 192.168.1.1
DNS 1: 8.8.8.8
DNS 2: 8.8.4.4
Another hidden problem is incorrect DNS servers. Even if you're connected to the router, the internet won't work if the device doesn't know where to send domain name resolution requests. Try setting up public DNS servers from Google or Cloudflare in your adapter settings.
It's also worth mentioning the encryption standards compatibility table, as older devices may not be able to see modern security settings.
| Security type | Compatibility | Recommendation |
|---|---|---|
| WEP | All devices | Do not use (extremely low protection) |
| WPA/WPA2 Mixed | Old and new gadgets | Optimal for mixed fleets |
| WPA3 | New devices only (after 2018) | Maximum protection, but may have problems with older printers |
| WPA2-PSK (AES) | Universal standard | Recommended choice for home |
Driver and network adapter failures on Windows
If your router is fine, the problem may lie in your computer's hardware or software. On Windows, outdated or broken firmware is a common cause of problems. drivers network card. The operating system may see the device, but it won't be able to work with it properly.
To diagnose the problem, open Device Manager. This can be done by right-clicking the Start button and selecting the appropriate item. Find the "Network Adapters" section. If next to the name of your WiFi card (often you'll see brands) Realtek, Intel, Qualcomm Atheros) the yellow exclamation mark is lit, the driver definitely requires updating or reinstallation.
⚠️ Important: Before uninstalling the driver, make sure you have internet access via cable or mobile phone to download the latest software version from the manufacturer's official website.
Resetting Windows network settings can also help. In a command prompt running as administrator, you can run a series of commands that flush the DNS cache and reset the TCP/IP stack. This often resolves issues when the system is stuck in an error state.
☑️ Network adapter diagnostics
Don't forget about power saving settings either. Windows may disable the WiFi module to save power, which can prevent it from waking up properly. In the adapter properties, under the "Power Management" tab, uncheck "Allow the computer to turn off this device."
Conflicts between the 2.4 GHz and 5 GHz frequency bands
Modern routers often operate in two bands: 2.4 GHz and 5 GHz. Older devices may not support the 5 GHz frequency, while newer ones, on the contrary, may act up if they see two networks with the same name (SSID) but different parameters. This phenomenon is called BSS Transition and is not always processed correctly by client devices.
If your device stubbornly refuses to connect, try separating the networks. Go to your router settings (usually at 192.168.0.1 or 192.168.1.1) and give different frequencies different names. For example, HomeWiFi_2.4 And HomeWiFi_5GThis will allow you to force the device to connect to the desired range.
The 2.4 GHz band has a longer range, but is heavily polluted by neighboring routers and microwave ovens. The 5 GHz band is faster and cleaner, but has poorer penetration through walls. If you're far from the router, your phone may see the 5 GHz network but won't be able to establish a stable connection due to the weak signal.
How to choose the best WiFi channel?
Use apps like WiFi Analyzer on your smartphone. They will show a channel load chart. Select the channel (1, 6, or 11 for 2.4 GHz) that is least occupied by neighbors.
Also check the channel width. For 2.4 GHz, it's best to set the channel width to 20 MHz to avoid overlapping. For 5 GHz, you can set it to 40 or 80 MHz for maximum speed, but if you're having connection issues, reducing the channel width often stabilizes the connection.
MAC address filtering and router restrictions
Your router may be configured to operate in "Whitelist" mode. This is a security feature that allows only devices whose MAC addresses (unique network card identifiers) are listed in a special table of authorized clients. If you bought a new phone or upgraded it and it can't connect, it's likely not on this list.
To check this, log in to your router's web interface. Find the "Wireless" -> "MAC Filtering" section. If the filter is enabled, you need to find your device's MAC address (found on the box, on a sticker under the battery, or in the "About Phone" settings) and add it to the list of allowed addresses.
Sometimes the problem lies in the DHCP client limit. In the settings Max DHCP Users There may be a limitation, for example, 5 or 10 devices. If you have a lot of smart devices in your home (lamps, outlets, vacuum cleaners), this limit may be reached, and new devices simply won't be assigned an address.
⚠️ Note: Router interfaces vary from manufacturer to manufacturer (Asus, Keenetic, TP-Link). Look for sections labeled "Wireless," "LAN," "DHCP Server," or "MAC Filter."
It's also worth checking whether the "Guest Network" feature with client isolation is enabled. If you're trying to connect to a guest WiFi network, devices on that network may be isolated from each other and from the main local network, which may appear to the user as a disconnected connection.
Specific errors on Android and iOS
Mobile operating systems have their own quirks when it comes to Wi-Fi. On Android, a common issue is the "Randomized MAC Address" feature, which is enabled by default for privacy reasons. Some older routers or corporate networks with filtering may block these "changing" addresses.
To disable this, go to your WiFi settings, click the gear icon next to your network (or select "Edit Network"), and under "Privacy" or "IP Settings," select "Use Device MAC Address" instead of "Random MAC." Then try reconnecting.
On Apple devices (iPhone, iPad), resetting network settings can sometimes help. This won't delete your photos or contacts, but it will erase all saved WiFi passwords and Bluetooth settings. Here's how: Settings → General → Transfer or reset iPhone → Reset → Reset Network Settings.
Another cause is an incorrect date and time. If the device's time is incorrect, security certificates may be invalid, and the connection will be blocked by the security system. Check if you have automatic time synchronization enabled.
Frequently Asked Questions (FAQ)
Why does WiFi connect, but it says "No Internet access"?
This means there's a connection between the device and the router, but the router can't access the external network. Check your ISP's cable, your account balance, or the WAN settings on the router. DNS may also be the issue.
What should I do if I forgot my WiFi password and can't connect?
Look at the password sticker on the bottom of the router (if you haven't changed the factory password). If you've changed it and don't remember, you'll have to reset the router to factory settings using the Reset button and then set it up again.
Does a phone case interfere with WiFi reception?
Yes, if the case contains metal elements or a thick layer of metal (for example, car holders with a magnet), it can shield the signal from the antenna located in the smartphone body.
How do I find out who is using my WiFi?
Log into your router's web interface (usually 192.168.0.1). All connected devices are displayed in the "Client List" or "Status" section. You can also block them there.
Why does the laptop see the network but not connect, while the phone connects?
The problem most likely lies with the laptop's WiFi module drivers or Windows power saving settings. It's also possible that the laptop is attempting to use an older security protocol that the router no longer supports.