When a message suddenly appears on the screen of your smartphone, tablet or computer that the lease expiresThis indicates a problem with the DHCP protocol. This mechanism is responsible for automatically assigning IP addresses to devices on the local network. If the license (lease) renewal process is interrupted, the device loses internet access, although the Wi-Fi connection itself may remain active. The user sees the status "Connected, no internet access" or cyclical attempts to obtain an address.
The main reason is that router The router and the client device cannot agree on the validity period of the assigned IP address. This is usually a temporary failure, but it can also be caused by an address table overflow, an IP conflict, or a software bug in the router firmware. In some cases, the problem lies in aggressive power-saving settings on the client itself, causing it to "sleep" and forget to request an extension on time.
You don't need to be a network engineer to solve this problem. Simply check your DHCP server settings, clear the network cache on the device, and, if necessary, manually assign the address. Below, we'll detail the steps for various scenarios so you can quickly restore stable internet access.
⚠️ Attention: Router settings interfaces (Asus, TP-Link, Keenetic, MikroTik) may vary. Look for sections labeled "DHCP Server," "LAN," "Network," or "Local Network." If you're unsure, take a screenshot of the current settings before changing them.
Diagnosing DHCP Lease Issues
Before changing settings, it's important to understand the scope of the problem. Does the "lease expires" error affect all devices in the house or just one specific one? If the internet connection drops on all devices at once, then the problem is on your end. router or your ISP. If the message only appears on one laptop, look for the cause in its network adapter or drivers.
A common culprit is address overflow. In standard home network settings, the router can distribute addresses from, for example, 192.168.1.100 to 192.168.1.150. If your network is connected to many smart bulbs, guest phones, and IoT devices, there may be no free addresses left. A new device simply won't be able to obtain an IP address, and an old one won't be able to update its own.
It is also worth paying attention to the time Lease Time (lease time). If it's set too short (for example, 1 minute), the device will be constantly busy requesting updates, generating unnecessary traffic and increasing the risk of failure if the signal is temporarily lost. The standard value for home networks is 120 minutes (2 hours) or 86400 seconds (24 hours).
Setting up a DHCP server on a router
The most effective way to fix this error is to log into your router's admin panel and adjust the address distribution settings. You'll need a browser and access to the management interface, usually accessible at 192.168.0.1 or 192.168.1.1.
Find the section responsible for the local area network (LAN). This is where the built-in DHCP serverYou need to make sure it's active and check the range of addresses being distributed. If the range is too narrow, expand it. For example, change the end address from .150 to .250, which will allow up to 150 devices to connect simultaneously.
☑️ DHCP setup
An important parameter is Lease TimeIncreasing this value reduces the load on the router's processor and decreases the number of overhead packets. However, setting this value too high (weeks) is also not recommended, as if network settings are changed (for example, by changing the gateway), clients won't be aware of the changes for a long time.
What to do if the DHCP server is disabled?
If the DHCP server is disabled, you'll have to manually enter the IP address, subnet mask, and gateway on each device. This is a time-consuming process, so it's best to simply enable DHCP in your router settings unless you have specific security requirements.
Resetting network settings on the client
If everything is fine on the router side, the problem may lie in stuck settings on your computer or phone. The operating system may have saved an incorrect IP address or previous session data that now conflicts with the current network status.
On Windows devices, the most effective method is to reset the TCP/IP stack via the command line. This will clear the DNS cache and reset all network settings to factory defaults, which often helps clear the lease expiration message.
To perform a reset, open a command prompt as an administrator and enter the following command:
netsh int ip resetAfter entering the command, be sure to restart your computer. On Android and iOS smartphones, the "Forget Network" feature works similarly. Find your Wi-Fi network in the list, tap it, select "Forget," and then reconnect by entering the password.
Setting up a static IP address
If dynamic address allocation continues to fail, you can switch to static IPThis means you manually assign a permanent address to your device, and it will stop requesting leases from the router. This radically solves the timeout problem.
To set up a static address, you need to know your current network settings: the gateway (router address) and subnet mask. Typically, the gateway is 192.168.1.1, and the subnet mask is 255.255.255.0. The static address should be in the same subnet, but outside the dynamic range to avoid conflicts.
| Parameter | Example of meaning | Description |
|---|---|---|
| IP address | 192.168.1.55 | Your device's unique address |
| Subnet mask | 255.255.255.0 | Determines the size of the network |
| Main gateway | 192.168.1.1 | Your router's address |
| DNS server | 8.8.8.8 | Name server (you can use Google) |
It's important to choose the right address number. If your router assigns addresses between .100 and .200, it's best to choose a static address in the range of .2 to .99. This ensures that the router doesn't automatically assign this address to another device.
⚠️ Attention: When manually assigning an IP address, make sure you're not using an address that's already in use by another device (such as a printer or TV). Duplicate IP addresses will result in network connectivity loss for both devices.
Updating drivers and firmware
Software errors are a common cause of unstable Wi-Fi modules. The computer's wireless adapter driver may incorrectly process lease renewal packets, especially if the device hasn't been updated in a while. Manufacturers regularly release patches to fix such bugs.
Visit your laptop or motherboard (for PCs) manufacturer's website and download the latest driver for your Wireless LAN Adapter. Don't rely on automatic installation via Windows Device Manager, as it often offers generic, but not always stable, versions.
A similar situation applies to the router itself. Firmware router There may be errors with the DHCP server. Go to "System Tools" or "Administration" and check for updates. If the automatic check fails, you can download the firmware file from the vendor's official website.
The impact of antiviruses and firewalls
Third-party antivirus and firewall software often includes its own network protection modules. These may block DHCP broadcast requests, considering them suspicious activity, or block UDP ports 67 and 68, which are critical for the protocol's operation.
Try temporarily disabling network protection in your antivirus and see if the error goes away. If the issue is resolved, add your network connection to the exceptions list or configure the network profile as "Home" or "Trusted," which have less stringent filtering rules.
Also, check your Windows Firewall settings. Make sure the DHCP Client service is running and working properly. To do this, click Win + R, enter services.msc and find the corresponding service in the list. Its status should be "Running" and its startup type should be "Automatic."
Frequently Asked Questions (FAQ)
What does "Lease Expires" mean in the Wi-Fi status?
This means your temporary IP address is about to expire, and your device is unable to receive renewal confirmation from the router. This is usually a short-term issue, but if it persists, the connection will be lost.
Why does rebooting the router help?
Rebooting clears the device's RAM, resets frozen DHCP server processes, and refreshes the ARP table, which often resolves address conflicts and software errors.
Can an ISP block DHCP?
Your ISP doesn't block your router's internal DHCP. However, if you're connected directly to the ISP's cable without a router, their server is assigning you an address. In this case, you should contact your ISP's technical support.
How often should Lease Time be changed?
For normal home use, the default value (120 minutes) is sufficient. It's only worth adjusting if you have a large number of devices (more than 50) or, conversely, if they're constantly changing (like in a cafe or an office with guests).