Many users are familiar with the situation where your smartphone or tablet endlessly displays the "Obtaining IP address" or "Connecting..." status, only to then simply disconnect. This annoying state means that physical contact with the router is present, but a logical connection cannot be established. The device is shouting into the airwaves, "I'm here, give me the address!" but the router either doesn't hear the request or refuses to respond.
The most common cause of this behavior is a service failure. DHCP (Dynamic Host Configuration Protocol), which automatically assigns unique numbers to all devices on the network. Without this digital passport, your Android or iPhone It simply isn't allowed to transmit data through the gateway. The problem could be a software glitch in the phone itself, an overcrowded router address table, or hidden security settings conflicts.
In this article, we'll examine all possible causes, from trivial password errors to complex MAC filtering conflicts. You'll learn how to diagnose the problem, reset network settings, and properly configure your router to prevent future freezes. Don't rush to a service center—in 90% of cases, the problem can be resolved with software solutions in just a few minutes.
How the connection process works and why it fails
To understand the problem, you need to imagine the "handshake" procedure between your gadget and the access point. When you select a network and enter the password, a four-step process occurs. First, there's a channel scan, then authentication (password verification), followed by association (binding to the access point), and finally, a request. IP addressesIt is at this last stage that failure most often occurs.
If your phone displays "Obtaining IP address," it means the password verification step has already been successfully completed. The router has confirmed that you are a member, but it can't allocate you a place in the data transfer queue. This could be because the DHCP address pool is exhausted, or the router's DHCP server is simply frozen and unable to process new requests. In rare cases, the phone itself sends an invalid request, which the router ignores.
⚠️ Attention: If you see the message "Obtaining IP address" on public Wi-Fi (at a cafe or hotel), the issue may be with your service provider. In such cases, browser authorization (Captive Portal) is often required, which won't launch until an IP address is obtained. Try opening a website manually after connecting.
It's important to distinguish between a physical Wi-Fi module failure and a software glitch. If other devices in the house connect to the same network without problems, the router is fine, and the problem should be looked for in your specific phone's settings. However, if all devices fail simultaneously, the problem lies in an overloaded router or its incorrect configuration.
The main reasons for the error on the smartphone side
The most common cause of failures is accumulated errors in the network settings of the mobile device itself. Operating systems Android And iOS They store profiles of all networks ever connected to, and sometimes this data conflicts with each other. For example, a phone might try to apply old encryption settings to an updated network, leading to a deadlock during address acquisition.
Another common cause is the "Randomized MAC Address" feature being enabled. Modern versions of Android and iOS hide the device's real physical address by default for security reasons. However, some older routers or configured security filters treat each new "random" address as a new device and block it if the connection limit is reached.
- 📱 DNS cache full: The phone tries to use old, no longer valid domain addresses, which blocks the connection.
- 🔒 Certificate conflict: Old security certificates may interfere when connecting to corporate or secure networks.
- 📶 Unstable signal: If the signal level drops below a critical threshold during a handshake, the IP acquisition process is interrupted.
It's also worth mentioning the impact of third-party applications. Antivirus programs, VPN clients, or data-saving programs can intercept network traffic and block standard DHCP requests. If the problem appeared immediately after installing new software, try temporarily disabling or uninstalling it.
Router and DHCP server configuration issues
If everything is fine with the smartphone, attention switches to the router. The main function responsible for issuing addresses is DHCP serverIt has a limited pool of addresses (for example, from 192.168.1.100 to 192.168.1.200). If you have a lot of smart devices in your home (light bulbs, outlets, TVs, guest phones), this pool may simply run out, and a new device will have nothing to assign.
Another common issue is static IP addresses. If you or the previous owner manually assigned IP addresses to devices, a conflict could occur. Two devices with the same address on the same network will not work, and one of them (usually the one requesting the address dynamically) will remain connected.
| Parameter | Optimal value | Possible problem |
|---|---|---|
| DHCP Range | 192.168.1.100 - 192.168.1.200 | The address range is too narrow |
| Lease Time | 120 minutes (2 hours) | Address held too long |
| Max Clients | 10-15 (for home) | Connection limit exceeded |
| Channel Width | 20 MHz (for 2.4 GHz) | Noisy air, packet loss |
Don't forget about router processor overload. Budget models may stop responding to service requests for new connections when under heavy bandwidth load (such as torrents or 4K streaming). In this case, the router is still online, and the internet works on other devices, but the new client cannot complete the initial authorization.
What is a static IP and why is it a problem?
A static IP is an address manually entered in your phone's settings. If you enter an address that's already taken by a router or another device, a conflict will occur. For home networks, it's best to always use "DHCP" or "Automatic" mode.
Step-by-step instructions: resetting and setting up the network on your phone
Let's start our diagnostics with the simplest and most effective method—a complete network reset. This won't delete your photos or apps, but it will forget all Wi-Fi passwords, Bluetooth settings, and cellular network parameters. This is guaranteed to fix software configuration errors.
On Android the path usually looks like this: go to Settings → System → Reset settings → Reset Wi-Fi, mobile data, and Bluetooth settingsOn . iPhone need to go to Settings → General → Transfer or reset iPhone → Reset → Reset Network SettingsAfter rebooting, the phone will be as good as new in terms of connections.
☑️ Quick Fix Checklist
If resetting doesn't help, try manually entering your DNS. Sometimes your ISP's DNS servers are unstable. Go to your Wi-Fi network properties, find the IP settings, and change them from "DHCP" to "Static." In the DNS 1 field, enter 8.8.8.8 (Google), and in DNS 2 - 1.1.1.1 (Cloudflare). Leave the IP address and gateway as suggested by the system, or select a free one from the router's range.
⚠️ Attention: When manually entering an IP address, make sure you're not using an address that's already in use. It's best to choose numbers at the end of the range. For example, if your router assigns IP addresses between 100 and 200, try entering 240. This will reduce the risk of conflict.
Setting up DHCP and filtering on a router
If the problem is widespread and affects all devices, you'll have to access your router settings. To do this, enter the gateway address (usually 192.168.0.1 or 192.168.1.1) and log into the control panel. You need the section LAN or DHCP Server.
First, increase the address pool. If the range is 100-110, expand it to 100-200. Also, check the parameter Lease Time (lease time). If it's set to "Infinite" or a very large value (a week), reduce it to 120 minutes. This will force devices to release addresses more frequently if they're disconnected from the network.
Pay special attention to filtering by MAC addresses. In the sections Wireless or Security An approved device list may be enabled. If your phone isn't on the list, it will remain connected indefinitely. Either add your phone's MAC address to the whitelist or temporarily disable filtering.
Radical measures and equipment diagnostics
Once software solutions have been exhausted, the only thing left to do is check the hardware. The phone's Wi-Fi module may have degraded or the antenna wire inside the device may have come loose (this is especially true after a fall). To diagnose the problem, try connecting the phone to a different Wi-Fi network (for example, sharing internet from another phone). If the error persists, the problem is definitely with the smartphone.
The situation with a router is more complicated. If it's old or overheating, its wireless module may be unstable. Try resetting the router to factory settings (press the button). Reset on the case) and configure it again. If this doesn't help, you may need to replace the device with a more powerful model that supports the standard. Wi-Fi 6.
As a last resort, if you need access urgently, you can try a static IP on your phone, completely disabling DHCP. Find the gateway (router address) on any other working device, for example, 192.168.1.1. On the problematic phone, in the Wi-Fi settings, select "Advanced" → "IP Settings" → "Static." Enter IP: 192.168.1.150, Gateway: 192.168.1.1, Network Prefix Length: 24, DNS: 8.8.8.8.
Example of static settings for manual input:IP address: 192.168.1.150
Gateway: 192.168.1.1
Netmask: 255.255.255.0 (or prefix 24)
DNS 1: 8.8.8.8
DNS 2: 1.1.1.1
Why does my phone connect to Wi-Fi but say "No Internet Access"?
This is a related issue. If you receive an IP address but there's no internet, it means the router can't connect to your ISP. Check the WAN cable, the router's connection status, and your account balance. It's also possible that the router's time settings are out of sync, and website security certificates aren't being verified.
Can antivirus block IP address acquisition?
Yes, some aggressive firewall settings in mobile antiviruses can block DHCP requests, considering them suspicious activity. Try temporarily disabling protection or adding your home network to the trusted list.
What to do if the error only occurs at 5 GHz?
The 5 GHz band has less penetration. If you're far from the router or behind a thick wall, the signal may be too weak for a stable handshake. Try switching to 2.4 GHz or moving closer to the signal source.