Your VPN disconnects unexpectedly, sometimes after just a few minutes, sometimes at the most inconvenient moment. The encrypted tunnel drops, your real IP address becomes visible again, and your data travels in plain text over the network. Understanding why a VPN disconnects on its own allows you to fix the problem at its source, not just to restart the application repeatedly.
VPN disconnection related to network handovers: the most common and least diagnosed case
Have you ever noticed that your VPN disconnects right when you switch from Wi-Fi to mobile data? This scenario has a technical name: network handover. When your device changes access points, the VPN tunnel loses its route and needs to be rebuilt.
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The problem is that many VPN clients do not handle this transition properly. The tunnel drops, and the automatic reconnection, if it exists, takes several seconds to trigger. During this time, your traffic goes outside the VPN.
This situation also occurs when you switch from one Wi-Fi network to another (for example, between two floors of a building, or between your router and a repeater). Every change of access point can disconnect the VPN tunnel. To limit this risk, disable the automatic Wi-Fi/mobile data switch in your phone’s network settings before starting a sensitive session.
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To delve deeper into this topic, several solutions for VPN disconnection detail the specific settings for each operating system.
Background restrictions on Android: your system disconnects the VPN without your knowledge
On Android, the operating system applies background restrictions to applications to save battery. Your VPN client is not exempt. When the screen turns off, Android may put the application to sleep, which disconnects the tunnel.
The setting to check is called Battery Optimization. By default, it is enabled for all applications. You need to manually exclude your VPN application from this optimization.
Settings to check depending on the phone brand
Some manufacturers add their own battery management layers. Samsung, Xiaomi, Huawei, or OnePlus each have additional menus that can block background activity.
- Background data: make sure your VPN application is allowed to consume data even when it is not in the foreground.
- Autostart or automatic startup: on Xiaomi and Huawei, this setting prevents the application from restarting after aggressive sleep. Enable it for your VPN.
- Allow background activity: on Samsung (in the “Battery and maintenance” menu), disable sleep for the VPN application so that it is not killed by the system.
Without these settings, your VPN disconnects as soon as you set your phone down. The protection drops exactly when you are not looking at the screen.
Timeout and keepalive: when the disconnection follows a regular pattern
Does your VPN always disconnect after the same period of inactivity? This is probably not a coincidence. A fixed-interval disconnection points to a timeout issue, either on the VPN server side or the network gateway side.
The mechanism at play is called keepalive. The VPN client regularly sends a small packet to the server to keep the connection active. If this packet is not sent often enough, the server considers the session dead and closes it.
How to identify a keepalive issue
Note the exact time of each disconnection over a day. If the interval between two disconnections is regular (every 30 minutes, every hour), the keepalive setting of your VPN client is probably too low. In the advanced settings of your application, look for an option “keepalive interval” or “persistent keepalive” and reduce the value (for example, from 60 seconds to 25 seconds).
On Windows, a documented case by Microsoft support shows that some third-party VPN connections disconnect after exactly one hour. The problem comes from a system setting that forces session renegotiation. Checking the network event logs can confirm this hypothesis.
VPN kill switch: protection or source of confusion
The kill switch is a feature that cuts off all internet access when the VPN drops. Its role is to prevent any data leaks. In theory, it is excellent protection. In practice, it sometimes creates confusion: you lose internet without realizing that it is the kill switch blocking it, not your connection.
The “Always-on VPN” feature, available on Android and some desktop clients, adds an extra layer. It forces the system to keep the tunnel active at all times. If the tunnel drops, all traffic is blocked.
The trap: when the kill switch activates, you see no typical network error message. Your browser simply displays “page inaccessible.” You think your router or plan has a problem, while the VPN has disconnected and the kill switch is doing its job.
Distinguishing a VPN disconnection from a kill switch block
Open your VPN application and check the connection status. If the application indicates “disconnected” but the kill switch is active, it is the kill switch that is blocking your access. Temporarily disable the kill switch to verify that your internet connection works, then restart the VPN.
This check takes a few seconds and avoids wasting time restarting your router or contacting your internet service provider for a problem that stems from your own VPN configuration.
VPN protocol and overloaded server: two variables to test quickly
When none of the previous leads resolve the issue, two settings deserve a quick test.
- Change the VPN protocol: if you are using OpenVPN (TCP), switch to WireGuard or OpenVPN (UDP). Some protocols handle unstable networks or restrictive firewalls better.
- Change the server: an overloaded VPN server causes frequent disconnections. Choose a geographically closer server with a lower load.
- Check that your firewall or antivirus is not blocking VPN traffic: add your VPN client to the exception list of your firewall and security software.
- Update your VPN application: stability patches often come through minor updates that we tend to postpone.
A VPN that disconnects on its own almost always has an identifiable cause. The diagnosis begins by observing the timing and regularity of the disconnection, then checking the network and system settings before adjusting the VPN client configuration itself.