What is a VPN kill switch?
A kill switch is a feature intended to block some network traffic if a VPN connection drops. Its exact behavior depends on the VPN app, operating system, settings, and traffic route.
Reduce traffic exposure during a drop
A VPN connection can disconnect when a network changes, a server becomes unavailable, or an app encounters an error. Without a blocking feature, some apps may continue connecting over the regular network path.
A kill switch is designed to block selected traffic until the VPN reconnects or you change settings. What it blocks and when depends on its implementation.
Questions to ask about the feature
Which traffic is blocked?
Does the feature cover all apps or only selected traffic? Does it apply to both Wi-Fi and mobile networks or only some connection types?
When does the block activate?
Check whether it responds to a VPN tunnel failure, startup, server change, device wake, or a network switch.
How does reconnection work?
Find out whether traffic stays blocked until the VPN reconnects, requires manual action, or follows another documented process.
Does the app support your device?
Feature behavior can vary by operating system, app version, provider implementation, and configuration.
What happens to local network access?
Some settings may also affect printers, local devices, captive portals, or other network services. Check the provider’s documentation.
Understand the trade-off
If the VPN fails, a strict block may interrupt internet access until the connection returns. That may be useful for some privacy needs and inconvenient when you need a reliable connection. Decide based on your situation and know how to reconnect.
Do not test by sending sensitive information over an unprotected connection. Follow the provider’s documented test or support instructions.
It does not stop every leak or threat
A kill switch does not prevent phishing, malware, account compromise, unsafe downloads, or every possible network issue. It is one control in a larger connection setup, not a guarantee of anonymity or security.
How to evaluate a VPN →Kill switch FAQ
Should I turn a VPN kill switch on?
It depends on your needs and how the feature works on your device. Read the provider’s current documentation so you understand what it blocks and how to restore connectivity.
Will a kill switch keep the internet connected?
No. It may intentionally block traffic during a VPN interruption. That can protect the selected traffic from using another route but may temporarily interrupt connectivity.
Does every VPN app have the same kill switch?
No. Availability and behavior vary by provider, operating system, app version, and settings.
What should I do if the internet stays blocked?
Follow the provider’s official recovery instructions, check the VPN app state, and contact provider support if needed. Avoid changing unfamiliar network settings without a recovery plan.
Look at the complete service
Consider provider support, privacy practices, device behavior, and current plan terms—not a single feature label.