ProtonVPN Security Best Practices: Kill Switch and Leak Protection
Lead: Many people assume installing a VPN means they are done, but poor configuration can leave leak gaps. This article offers a security checklist for ProtonVPN across Kill Switch, leak protection and daily habits, so you actually get its full protection.
A VPN's protection is conditional: as long as the connection is up, traffic is safe; the moment it drops, traffic can "go bare". Understanding this is the starting point for every security setting. Let's close these leak points one by one.
1. Kill Switch: the first gate
Kill Switch cuts the device's network connection the instant the VPN drops unexpectedly, preventing any plaintext transmission. Find it under Settings > Advanced and enable it.
ProtonVPN's Kill Switch offers two modes: the global mode blocks the whole device; the app mode blocks only chosen apps while others stay direct. For strictly confidential work, choose the global mode.
| Mode | Scope | Use case |
|---|---|---|
| Global | Whole device | High-sensitivity work, public Wi-Fi |
| App | Selected apps | Gaming, local services needing direct access |
2. Leak protection: DNS, WebRTC, IPv6
Even with a live connection, a few side channels can expose you. DNS leaks let queries bypass the tunnel, WebRTC can reveal your real IP, and IPv6 traffic can escape the tunnel. ProtonVPN ships a private DNS and leak protection enabled by default — no manual configuration needed.
| Leak type | Risk | ProtonVPN protection |
|---|---|---|
| DNS leak | ISP sees your browsing | Built-in private DNS |
| WebRTC leak | Real IP exposed | Auto-blocked |
| IPv6 leak | Some traffic escapes | IPv6 blocked |
3. Daily habits checklist
Beyond settings, habits matter too. Enable auto-start and auto-connect; on public Wi-Fi, always connect the VPN before logging into sensitive accounts; keep the client updated for security fixes.
Real case: Chen, in Shenzhen, stayed at a hotel where unstable Wi-Fi caused repeated VPN drops. Because he had enabled Kill Switch in advance, the network was cut the moment the tunnel dropped. He later verified with packet capture that no plaintext data leaked. "The switch is invisible day to day, but it saves you at the critical moment," he said.
4. Summary
Back to the opening point: a VPN only protects when configured properly. Enabling Kill Switch, confirming leak protection is on, and forming safe habits — none are hard, yet together they sharply raise your online safety. If you have not configured yet, start with the free VPN download, open the ProtonVPN client and spend two minutes on these settings.
User Comments
Kill Switch really saves you — every beginner should read this.
Never thought about IPv6 leaks before; checked the whole list and feel safer.
The two Kill Switch modes are now clear — turned on global mode.