"Unable to Obtain an IP Address" Error When Connecting to Wi-Fi: A Complete Analysis of Causes and Solutions

You're trying to connect to Wi-Fi, but instead of a stable connection, you see an annoying notification: "Unable to obtain IP address"My smartphone, laptop, or tablet stubbornly refuses to connect to the internet, even though other devices are working fine. What's going on? Why isn't my router assigning an IP address, and how can I get it to do so?

This error is one of the most common in home networks, and its causes lie in both device settings and issues on the router side. In 80% of cases, DHCP server failure (a protocol that automatically assigns IP addresses), but sometimes the root of the problem lies deeper: from IP conflicts to hardware malfunctions. In this article, we'll look at all possible scenarios — from basic to exotic, — and we will also give step-by-step instructions for Android, Windows, iOS and even Smart TV.

Spoiler: in 95% of cases, the problem can be solved without calling a technician. But to do this, you need to accurately diagnose the source of the problem. Let's start with the simplest.

1. What does "failed to obtain IP address" mean?

Message "Unable to obtain IP address" (or Obtaining IP address... followed by a disconnection) means that your device sees the network, successfully connects to it on a physical level (that is, the password is entered correctly), but cannot obtain a unique network address from the routerWithout an IP address, a device cannot exchange data with the internet or other devices on the local network.

Here's how the process normally works:

  1. The device sends a request to the router: “Give me an IP address!” (DHCP Discover).
  2. The router replies: “Here’s your address 192.168.1.100, mask 255.255.255.0, gateway 192.168.1.1» (DHCP Offer).
  3. The device acknowledges receipt and begins using the address (DHCP Request/Ack).

If any of these steps fail, you see an error. The reasons range from the trivial DHCP server freezes to incompatibility of Wi-Fi standards.

📊 On which device did you experience the error?
Android smartphone
iPhone/iPad
Laptop/PC with Windows
Smart TV or set-top box
Other device

2. Causes of error: from simple to complex

We'll examine all possible sources of the problem, from those that can be resolved in 1 minute to rare cases that require in-depth diagnostics.

2.1 Temporary DHCP failure on the router

The most common reason is The router's DHCP server is frozen. and stopped distributing addresses. This happens because:

  • 🔄 Long operation without rebooting (especially relevant for budget router models).
  • ⚡ Power surges, after which the router operates unstably.
  • 📡 Network congestion (too many devices connected).

Solution: reboot the router (Pull the plug out of the socket for 30 seconds). This helps in 60% of cases.

2.2 IP address conflict

If two devices on the network receive the same IP address (for example, 192.168.1.101), a conflict arises, and the router blocks the issuance of addresses. This can happen if:

  • 🖥️ One of the devices has static IP manually (for example, a printer or IP camera).
  • 🔄 The router has reset its settings, but the devices "remember" the old addresses.
  • 📱 The smartphone is in the "Smartphone mode" USB modem or Access point, which conflicts with the main network.

2.3. Incorrect network settings on the device

Sometimes the problem lies in the gadget itself:

  • 📵 On Android mode is on Flight mode or Battery saving, blocking network functions.
  • 🖥️ On Windows the parameters are out of order TCP/IP (for example, after a virus or update).
  • 📺 On Smart TV installed static IP, which is no longer relevant.

2.4. Problems with the router firmware

Outdated or faulty firmware can cause DHCP failures. This is especially true for routers:

  • 🏷️ TP-Link Archer C20/C50, D-Link DIR-300/615 (there are known bugs with DHCP in older versions of the software).
  • 🔄 After an unsuccessful firmware update.
  • 🛠️ With custom firmware (DD-WRT, OpenWRT), where DHCP is configured incorrectly.

2.5. Hardware malfunctions

If none of the methods helped, the following are possible:

  • 📡 Problems with the Wi-Fi module devices (for example, after a smartphone falls).
  • 🔌 LAN/WAN port failure on the router.
  • 🔥 Chip overheating router (relevant for models without ventilation).
How to check if the router or device is at fault?

Connect another device (for example, a second smartphone) to the network. If it connects normally, the problem is with the first device. If the error persists, the router or ISP is to blame.

3. How to fix the error on Android

On smartphones and tablets with Android error "Unable to obtain IP address" Most often it is solved in one of the following ways.

3.1 Forget the network and reconnect

The simplest method that works in 40% of cases:

  1. Open Settings → Wi-Fi.
  2. Tap on your network name and select Delete (or Forget).
  3. Please reconnect by entering your password.

3.2. Turn on/off airplane mode

Quick reboot of network modules:

  1. Activate Airplane mode in the notification curtain.
  2. Wait 10 seconds.
  3. Disable the mode and try connecting to Wi-Fi.

3.3. Assign a static IP manually

If DHCP does not work, you can set the address manually:

  1. Go to Settings → Wi-Fi → [Your network] → Change network.
  2. Turn on Additional options (or Advanced settings).
  3. In the field IP settings select Custom.
  4. Please specify:
    • IP address: 192.168.1.X (where X is a number from 10 to 99, not occupied by other devices).
    • Gateway: 192.168.1.1 (usually matches the router address).
    • Network prefix length: 24.
    • DNS 1: 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare).

3.4. Reset network settings

If nothing helps, reset your network settings to factory defaults:

  1. Open Settings → System → Reset → Reset Wi-Fi, mobile network, and Bluetooth settings.
  2. Confirm the action.
  3. Restart your device.
⚠️ Attention: This method will delete all saved networks and passwords!

Delete network and reconnect|Restart airplane mode|Assign static IP|Reset network settings-->

4. Solution for Windows 10/11

On PCs and laptops with Windows This error is often related to a service or driver failure. Let's look at the steps.

4.1. Restarting the DHCP Client Service

If the service responsible for obtaining IP has stopped, it needs to be restarted:

  1. Click Win + R, enter services.msc and press Enter.
  2. Find a service DHCP client.
  3. Right click and select Restart.

4.2. Resetting the TCP/IP stack

Commands to reset network settings (run as administrator):

netsh int ip reset

netsh winsock reset


ipconfig /release


ipconfig /renew


ipconfig /flushdns

Once completed, restart your PC.

4.3. Updating the Wi-Fi adapter driver

An outdated or corrupted driver may block IP acquisition:

  1. Open device Manager (Win + X → Device Manager).
  2. Expand the section Network adapters.
  3. Find your Wi-Fi adapter (e.g. Qualcomm Atheros or Intel Wireless-AC).
  4. Right click and select Update driver.
⚠️ Attention: If Wi-Fi has disappeared completely after updating the driver, roll back to the previous version in the same menu.

4.4 Disabling power saving for the adapter

Windows Sometimes turns off Wi-Fi to save power:

  1. IN Device Manager Open the properties of your Wi-Fi adapter.
  2. Go to the tab Power management.
  3. Uncheck the box Allow the computer to turn off this device to save power.

5. Router setup: fixing DHCP

If the problem occurs on all devices, the router is to blame. Let's look at the key settings.

5.1. Checking if DHCP is enabled

Make sure the DHCP server is activated:

  1. Go to the router's web interface (usually at 192.168.1.1 or 192.168.0.1).
  2. Default login and password: admin/admin (or see the sticker on the router).
  3. Go to the section DHCP (or Local Network → DHCP Server).
  4. Make sure the switch is in the on position. On.

5.2 Changing the IP address pool

If the addresses are in the range 192.168.1.100–192.168.1.199 conflict, expand the pool:

Parameter Recommended value Note
Initial IP 192.168.1.10 It's best to start with 10 to avoid conflicts with manual settings.
Final IP 192.168.1.200 Should be 50-100 addresses larger than the initial one
Rental time 24 hours Too small a value may cause crashes.

5.3. Changing the Wi-Fi channel

A congested channel can interfere with a stable connection:

  1. In the router's web interface, find the section Wi-Fi (or Wireless network).
  2. Change it Channel With Auto to a fixed one (for example, 6 or 11 for 2.4 GHz).
  3. For 5 GHz, select a channel from the range 36–48 or 149–165.

5.4. Updating the router firmware

Outdated software may contain DHCP errors:

  1. Download the latest firmware from the manufacturer's website (for example, tp-link.com For TP-Link).
  2. In the router's web interface, find the section Software update (or Firmware Upgrade).
  3. Download the file and wait for the process to complete (do not turn off the power!).
⚠️ Attention: Do not update firmware via Wi-Fi—connect to the router via cable to avoid connection interruptions.

6. Rare cases and exotic solutions

If standard methods don't work, the problem may lie in less obvious places.

6.1. MAC filtering on a router

Some routers block devices by MAC address (unique identifier of the network card). Check:

  1. In the router's web interface, find the section MAC filter (or Wireless MAC Filtering).
  2. If the filter is enabled, add your device's MAC address to the allowed list.

    3. Find out the MAC address:

    • On Android: Settings → About phone → General information → Wi-Fi MAC address.
    • On Windows: run in command line ipconfig /all and find the line Physical address.

    6.2. Conflict with VPN or firewall

    IP changing programs or firewalls may block the address from being received:

    • 🛡️ Temporarily disable VPN (For example, NordVPN, ProtonVPN).
    • 🔥 Disable the firewall (Windows Defender, Kaspersky, Avast).
    • 📱 On Android check apps like NetGuard or AFWall+.

    6.3. Problems on the provider's side

    Sometimes the error is related to the provider settings:

    • 📡 Check if your ISP blocks DHCP (relevant for some MAC-based plans).
    • 🔄 Reboot modem (if it is separate from the router).
    • 📞 Call support and check if there is any maintenance going on.
    ⚠️ Attention: if the provider uses PPPoE or L2TP, make sure that the login/password for connection is entered correctly in the router settings (section WAN or Internet).

    6.4. Hardware malfunctions

    If nothing helps, the following are possible:

    • 📱 Damage to the Wi-Fi module on the device (check if it picks up other networks).
    • 🔌 LAN/WAN port failure on the router (try connecting via cable).
    • 🔥 Router overheating (Place it in a ventilated place or direct a fan).

    In such cases it may be necessary repair or replacement of equipment.

    7. FAQ: Answers to frequently asked questions

    ❓ Why does the error only appear at night?

    Probably your router overheats After a long period of work, or the provider is performing maintenance during off-peak hours. Try:

    • Reboot your router before going to bed.
    • Place it in a ventilated area.
    • Call your provider's support team and clarify the work schedule.
    ❓ Can a virus cause this error?

    Yes, some viruses (eg. Trojan.DHCP) block the DHCP client. Follow these steps:

    • Full system check Malwarebytes or Kaspersky Virus Removal Tool.
    • Reset network settings (see section 3.4 for Android or 4.2 for Windows).
    ❓ Why does the error only occur on 5 GHz, but everything works on 2.4 GHz?

    This is typical for:

    • Legacy devices that do not support 802.11ac (Wi-Fi 5).
    • Incorrect channel settings on the router (try setting it manually) 36, 40 or 48).
    • The distance to the router is too great (5 GHz is worse at passing through walls).
❓ How do I check if DHCP is working on my router?

Connect to the router via cable and:

  1. On Windows run in command line: 
    ipconfig /all

    If in the line IPv4 address specified 169.254.x.x — DHCP is not working.

  2. On Android install the application PingTools Network Utilities and check the DHCP status in the section LAN.
❓ Is it possible to use the Internet without an IP address?

No, without an IP address, the device cannot exchange data. However, there are workarounds:

  • Assign static IP manually (see section 3.3).
  • Use USB modem or mobile Internet.
  • Connect via Ethernet cable (if DHCP only works for Wi-Fi).

📖 Read also

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