Your PC and the server agree on keys
When you press Connect, the app and the VPN server prove who they are and agree on fresh encryption keys. Nobody watching the network can work out those keys.
Follow the beam.
What happens between pressing Connect and seeing four green ticks, explained without jargon.
Everything is wrapped and encrypted
Each piece of data your PC sends is encrypted and placed inside a new packet addressed to the VPN server. Your router and internet provider only see these sealed packets.
The server forwards your request
The VPN server decrypts the packet and sends the request to the website using its own IP address. Replies take the same route back, encrypted again.
The app keeps checking
VPN for WINDOWS constantly checks that the tunnel is up, DNS lookups stay inside it, and the kill switch is armed. That is what the four green ticks report.
Protocols
Which tunnel to choose.
A protocol is the set of rules a tunnel follows. VPN for WINDOWS picks the best one automatically. Here is how the common protocols compare.
| Protocol | Security | Speed | Best for | In VPN for WINDOWS |
|---|---|---|---|---|
| WireGuard | Strong modern cryptography (ChaCha20-Poly1305) | Very fast | Everyday use, gaming, video calls | Default |
| OpenVPN | Strong TLS with AES-256-GCM | Good | Restrictive networks; TCP mode passes most firewalls | Included |
| IKEv2/IPsec | Strong with modern cipher settings | Fast | Laptops switching between Wi-Fi and mobile data | Included |
| L2TP/IPsec | Acceptable but dated | Slower | Older equipment only | Not used |
| PPTP | Broken encryption, avoid | Fast | Nothing; considered insecure | Never |
Good to know
What a VPN does not do.
Clear expectations keep you safer. A VPN is one layer of protection, not all of it.
- It is not antivirus. Keep Windows Security on to catch malware.
- It does not stop phishing. A fake login page is still fake through a tunnel.
- It does not make you anonymous. Sites still recognise you through logins, cookies and browser fingerprinting.
- It does not replace updates. Apply Windows updates promptly, because unpatched systems are the easiest target.
- It does not change the law. VPNs are legal in most countries but restricted in some, and anything illegal stays illegal through a VPN. Check local rules when you travel.