VPN not working: what to check first

A short checklist for client, key, network, DNS, battery restrictions and route issues.

A VPN issue can come from the client, key, network, DNS, device settings or the route itself. Debugging is easier when you separate these layers.

Start with simple checks before changing every device setting.

Quick checklist

Run the same checks on Wi-Fi and mobile data if possible.

Use a short paid test to check the route on your real mobile network, Wi-Fi and devices.

Start with a short plan so you can check the route before committing to a longer subscription.

After payment, import the key into Happ or another compatible client.

Test Telegram, browser access, DNS and speed on the network where you actually need VPN.