The situation where a device finds your home network but gets stuck on the "Obtaining IP address" status or returns the "Unable to connect" error is familiar to many users. Most often authorization problem The problem isn't a physical failure of the antenna, but a software conflict between the client (smartphone, laptop) and the access point. The failure can occur at any stage of the handshake: from password verification to assigning network coordinates.
Sometimes the cause is a simple typo in the password, but in 40% of cases, the router's security settings or an overflowing DHCP client table are to blame. Encryption protocols WPA2 and WPA3, designed to protect data, can block connections if the versions on devices don't match. Understanding the mechanics of this process will help you quickly diagnose the problem without calling a technician.
In this article, we'll examine in detail all possible access denial scenarios. We'll cover both operating system software glitches and hidden router settings that are often overlooked during initial setup. A critical factor is often the mismatch between AES and TKIP encryption standards., making it impossible to complete the network login procedure.
Password errors and keyboard layout issues
The most obvious, yet often overlooked, cause is an incorrect password. When you enter the security key, the system doesn't always immediately report an error, attempting to establish a connection several times. If the router is configured to hide the SSID or uses complex characters, the risk of error increases. It's important to check carefully. letter case and the keyboard layout, especially on mobile devices, where autocorrect may unnoticeably change the characters you type.
Users often confuse similar characters, such as zero and the letter "O," or one and the letter "l." In complex passwords with special characters (e.g., !, @, #) The mobile keyboard may offer substitutes that are technically different from the original characters. If you recently changed your password, make sure you have the latest version of the passcode saved on all your devices.
⚠️ Attention: When entering a password via QR code, make sure the code doesn't contain any extra spaces at the beginning or end of the line. This is a common error with QR code generators in router admin panels.
To eliminate human error, try connecting a device with a physical keyboard or copy the password into a text editor to visually verify its correctness. It's also worth checking that the "Show Password" feature is not enabled in your smartphone's Wi-Fi settings so you can see exactly what you're entering.
DHCP server failure and IP address acquisition
If the password is accepted but the connection fails, it's likely that the device is unable to obtain an IP address. This function is controlled by DHCP server, built into the router. It has a limit on the number of simultaneously connected clients. If the address table is full (for example, due to a large number of smart devices or old connections that weren't properly disconnected), there simply won't be enough "space" on the network for a new device.
Sometimes the problem stems from an IP address conflict, when the router mistakenly assigns the same address to two different devices. This causes chaos in data packets, and authorization fails. In this case, you may see messages in the router logs about Duplicate IPRebooting the router usually clears the address lease table and solves the problem.
In some cases, manually setting a static IP address on the problematic device can help. This bypasses the DHCP queue, but requires knowledge of the address range of your subnet. Typically, these are addresses of the form 192.168.0.X or 192.168.1.X.
☑️ DHCP Diagnostics
MAC address filtering and access restrictions
One of the most reliable, but also most problematic security features is filtering by MAC addressesEach network interface has a unique identifier. If the "White List" mode is enabled in the router settings, only devices whose addresses are added to the database are allowed to connect. Any new device, even with the correct password, will be denied authorization.
There's also a reverse mode—"Blacklist" (Deny List)—that blocks specific devices. An error can occur if you accidentally added your smartphone to the blacklist or if the MAC address was mistyped when setting up the whitelist. This can only be verified through the router's web interface.
| Filtration type | Operating principle | Result for a new device |
|---|---|---|
| Disabled | Access is granted to everyone | Connection with a password |
| Whitelist (Allow) | Access only to selected people | Access denied (no entry) |
| Blacklist (Deny) | Blocking Favorites | Connection (if not in the list) |
To find your device's MAC address, look at the sticker under the battery (for older phones) or in the settings: Settings → About phone → StatusOn computers, the command can be run in the terminal: ipconfig /all (Windows) or ifconfig (Linux/Mac).
Where can I find my MAC address on Android?
On most Android smartphones, the path is: Settings -> About phone -> General information (or Status) -> Wi-Fi MAC address. Please note that modern versions of Android may use a randomized MAC address for privacy protection, which can cause filtering issues. In this case, you should select the "Use device MAC address" option in the settings for the specific Wi-Fi network.
Incompatibility of security and encryption protocols
Modern routers support various encryption standards: WEP (outdated), WPA/WPA2 and the newest WPA3If the router is set to "WPA3 Only," older laptops or budget smartphones from 2015-2018 may simply not see the network or fail authentication because their network cards don't understand the new protocol.
A similar situation arises with data encryption algorithms. TKIP And AESWPA2 requires the use of AES. If the router is set to compatibility mode WPA/WPA2 - TKIP/AESSome devices may get stuck at the algorithm selection stage. The optimal solution is to set the device to strict mode. WPA2-PSK (AES).
The problem can also occur when switching between frequency bands. If the router broadcasts one network (Smart Connect) for both 2.4 GHz and 5 GHz, the device may attempt to log in to one band, but the router switches to the other, where the signal is weaker or the settings are different. Separating networks into Home_2.4 And Home_5 often helps to localize the problem.
Buffer memory overflow and router software failures
A router is also a computer, with its own operating system and RAM. If it runs for a long time without rebooting, errors can accumulate in the logs, and free memory can run out. This leads to the process wpa_supplicant (responsible for authorization) stops responding to new client requests.
Background processes, such as automatic firmware updates or active torrent downloads, can also be the cause, as they can consume up to 100% of the router's CPU. At these times, the router simply doesn't have enough resources to handle the handshake of a new device. The indicators on the router may flash erratically or remain lit.
⚠️ Attention: If the router gets hot and is located in direct sunlight or in a closed area, overheating of the processor may cause intermittent Wi-Fi module failures. Ensure adequate ventilation of the device.
The solution is to reboot your hardware regularly (every 1-2 weeks). If the problem occurs frequently, it might be worth updating. firmware router to the latest version available on the manufacturer's website, as older versions may contain bugs in the wireless drivers.
Client-side settings conflicts (smartphone/PC)
The router isn't always to blame. Client-side errors can also occur. For example, the "Randomized MAC" feature, introduced in iOS 14 and Android 10+, creates a virtual address for each network. If the router is configured rigidly or has restrictions, it may block these "changing" addresses.
Deleting the network profile also helps. The device may have saved old security settings (such as encryption type) that were changed on the router. When attempting to connect, it uses the old data, is rejected, and doesn't request new ones. Completely deleting the network (Forget the network) forces the phone to request the current parameters again.
In rare cases, antivirus software or VPN clients on your phone may block the connection at a low level, considering the network suspicious. Try temporarily disabling protection and checking authorization. Resetting the device's network settings (Reset network settings) returns all network modules to factory settings.
Frequently Asked Questions (FAQ)
Why does my laptop say "Can't connect to this network" even though the password is correct?
Most likely, an old network profile with different security settings is saved on your laptop. Right-click the network, select "Forget" or "Delete," and try connecting again using the password.
My phone connects to Wi-Fi, but it says "No internet access." Is this an authorization issue?
No, authorization was successful (the keys were accepted), but the device can't access the external network. The issue could be with the provider's cable, DNS settings, or a low account balance.
Can antivirus software on a PC block Wi-Fi connections?
Yes, some firewalls included with antivirus software may classify a new network as "Public" and block all incoming/outgoing connections until the user confirms.
What should I do if the router doesn't see any devices after a reset?
If all devices stop connecting after a reset, your wireless settings may be corrupted. Try connecting to the router via cable and check if the Wi-Fi radio is enabled in the settings. Wireless Settings.