The situation when the smartphone is based Android A wireless network that refuses to connect can catch you off guard at the most inopportune moment. You see a familiar network icon in the list, enter the password, but the system returns an "Unable to connect" error or remains stuck on the "Obtaining IP address" status. This is a common problem that often stems not from hardware failure, but from a software conflict or incorrect security protocol settings.
There can be many reasons for this behavior, from an overflowing network settings cache to incompatible encryption standards between the router and mobile device. Sometimes the culprit is a manually assigned static IP address that conflicts with the router's broadcast range. In other cases, the problem lies in MAC filtering or outdated Wi-Fi module drivers.
In this article, we'll take a detailed look at all possible connection failure scenarios. We'll cover everything from simple reboots to complex DNS manipulations and resetting network settings. Understanding the nature of the error will help you quickly restore internet access without a trip to a service center.
Basic diagnostics and module reboot
The first and most effective step for any network issue is a complete hardware reboot. This clears the router's temporary memory buffers and resets frozen processes in the phone's operating system. Often DHCP server The router stops issuing new addresses due to the lease table being full, and a reboot resolves this issue instantly.
Don't just turn off your smartphone's screen. Perform a full power cycle. It's also worth rebooting the router itself by unplugging it for 10-15 seconds. This time is necessary for the capacitors to fully discharge and the router's RAM to clear.
If the issue persists after a reboot, try "forgetting" the network on your phone. To do this, go to Wi-Fi settings, tap the desired network, and select "Delete" or "Forget." Then scan for networks again and enter the password. This removes saved security configurations and encryption keys that may have become corrupted.
Problems with DHCP and static IP address
One of the most common causes of connection errors is an address conflict. In normal mode, the router automatically assigns a unique address to each device. IP addressHowever, if a static address is manually entered into the phone settings and is already in use by another device or is outside the subnet range, the connection will not be established.
To check and change these settings, go to the Wi-Fi menu, click the gear icon next to your network, or select "Advanced." Find "IP Settings" (or "IP Parameters"). If "Static" is selected, switch it to DHCPThis will force the phone to request the current address from the router.
☑️ Check IP settings
In rare cases where a static address is required (for example, to access a local server or printer), you need to ensure you enter the correct information. The gateway should match the router's IP address (usually 192.168.0.1 or 192.168.1.1), and the DNS can be a public one, such as Google's.
| Parameter | Value for DHCP | Example for Statics | Description |
|---|---|---|---|
| IP address | Automatically | 192.168.1.15 | The unique address of a device on the network |
| Gateway | Automatically | 192.168.1.1 | Router address (Internet access) |
| Prefix length | Automatically | 24 | Specifies the subnet mask (255.255.255.0) |
| DNS 1 | Automatically | 8.8.8.8 | Primary Domain Name Server |
⚠️ Attention: When manually entering a static IP, make sure that the last digit of the address (host) is in the range from 2 to 254 and is not occupied by another device, otherwise an address conflict will occur.
Date, time, and security certificate errors
Modern security protocols such as WPA2-Enterprise or WPA3, are critically dependent on the correct system time. If the date on your phone is incorrect (for example, if it's set to 2015), the security certificates will be invalidated, and the router will reject the connection attempt.
Check the date and time settings in the section System → Date and TimeMake sure "Use network time" or "Automatic date and time" is enabled. Synchronization via NTP servers ensures that certificate timestamps are accurate.
The issue may also lie in the encryption type. Some older phones don't support new encryption standards. AESif the router is configured in compatibility mode TKIP+AES or just TKIPIn the router settings (in the Wireless Security section), it is recommended to set the mode WPA2-PSK (AES), as it is the most stable and compatible.
Why does encryption type matter?
The encryption type determines how data is encrypted during transmission over the air. If your phone and router "speak" different encryption languages (for example, one requires WPA3 and the other only supports WPA), the handshake will fail, and you'll see an authentication error.
Impact of frequency range and Wi-Fi channel
Dual-band routers broadcast on both 2.4 GHz and 5 GHz frequencies. Older phone models may not be able to see 5 GHz networks or may have unstable performance. If your smartphone isn't connecting, try temporarily disabling one of the bands in your router settings or separating them into different names (SSIDs), for example, MyWiFi And MyWiFi_5G.
Another hidden problem is channel congestion. In apartment buildings, dozens of routers operate on the same frequencies, creating a jumble of radio signals. If the channel is set to "Auto," the router may frequently switch, causing disconnects or even an inability to connect.
For diagnostics, use Wi-Fi analyzer applications (for example, WiFi Analyzer). They will show which channels are free. In the 2.4 GHz band, only channels 1, 6, and 13 (or 11 in the US) are non-overlapping. Setting a fixed channel in the router settings often improves connection stability.
⚠️ Note: Channels 12 and 13 in the 2.4 GHz band may not be available for devices released for the US market due to regulatory restrictions. If your phone is a US phone, use channels 1–11.
Resetting Android network settings
If the software issue extends beyond just a single network's cache, a full network reset will help. This will reset all Wi-Fi, Bluetooth, and mobile network settings to factory defaults. This is safe for your personal data (photos, contacts), but you'll have to re-enter passwords for all known Wi-Fi networks.
To perform a reset, follow the path Settings → System → Reset settings → Reset Wi-Fi, mobile, and Bluetooth settingsOn some shells (for example, MIUI or OneUI) the path may differ: look for the "Connections" or "General Management" section.
After the reset, the phone will reboot. Try connecting to the network again. If this doesn't help, the problem may be a conflict with a specific app or antivirus software that is blocking the connection. Try starting the phone in Safe mode (usually by holding down the power button on the menu screen) and check the Wi-Fi operation.
Maximum number of connected devices
Home routers, especially budget models or devices provided by your provider, have a limit on the number of simultaneously connected clients. Typically, this limit is 10-15 active devices. If you have a lot of smart devices (lamps, outlets, TVs, guest phones), this limit may be reached.
In this situation, the new device simply won't receive an IP address because the DHCP address pool has been exhausted. There's only one solution: log into the router's interface (via a browser on a computer connected via cable) and either increase the address range or disable unnecessary devices.
It is also worth checking whether the function is enabled on the router MAC filteringIf it's enabled in "Whitelist" mode, only devices whose MAC addresses are added to the allowed list can connect. Find your phone's MAC address (in the "About phone" section or in the Wi-Fi status) and add it to the allowed list in the router settings.
How to find MAC address?
A MAC address is a unique identifier for a network card. On Android, you can find it in Settings → About phone → General information. It appears as a colon-separated string of characters, for example: AA:BB:CC:11:22:33. Please note that newer versions of Android may use a "Random MAC address" for each network to protect your privacy. If your router filters by MAC address, you should select "Use device's MAC address" for that specific network in your phone's Wi-Fi settings.
Frequently Asked Questions (FAQ)
Why does my phone say "Obtaining IP address" and then reset?
This means the phone sent a request to the router but didn't receive a response. Most likely, the router's DHCP server is overloaded, MAC filtering is enabled and blocking the device, or the encryption type is incorrect. Restarting the router or changing the security type to WPA2-PSK may help.
Can antivirus block Wi-Fi on Android?
Yes, some "Network Protection" or "Firewall" features in third-party antivirus programs may mistakenly block connections to new or public networks. Try temporarily disabling your antivirus to check.
What to do if Wi-Fi works but there is no internet?
This is a different issue. Most likely, your provider is experiencing an outage or your account is out of funds. Also, check that the date and time are set correctly, as browsers won't open HTTPS sites if the time is incorrect.
Does changing DNS to 8.8.8.8 help?
Changing your DNS to Google's public servers (8.8.8.8) or Cloudflare's (1.1.1.1) often solves problems with opening websites if your provider blocks its DNS, but rarely helps if your phone can't connect to the access point at all.