In a VPN based connection, supported traffic travels through an encrypted tunnel before reaching its online destination. Websites generally see the VPN server’s public IP address. But how will you know your VPN is working? With these tips, you can test your IP address, DNS requests, browser behavior, IPv6 connection, speed, kill switch, and basic connection stability.
7 simple tests to check your VPN connection
Before running tests, it helps to know what to expect.
When a VPN is connected correctly:
- Supported traffic should travel through the VPN connection.
- Websites should generally see the VPN server’s public IP.
- DNS requests should follow the VPN’s configured DNS setup.
- Your VPN app should report an active connection.
- Your internet connection should keep working normally.
A VPN does not make you completely anonymous. Account logins, cookies, browser details, GPS, and other information can still identify or recognize you.
It also does not replace antivirus software or protect you from every phishing attempt or unsafe download.
1. Check your public IP address
An IP leak test is one of the easiest ways to check a VPN connection.
- Start with the VPN disconnected.
- Visit a reputable IP-checking website and note your current public IP address.
- Next, connect to your VPN server and refresh the page.
If the VPN is routing your browser traffic, the displayed public IP should normally change to the VPN server’s IP.
You can follow these steps:
- Disconnect the VPN.
- Check your current public IP.
- Connect to a VPN server.
- Check the IP again.
- Compare the results.
If your original public IP still appears, check your VPN configuration. Keep split tunneling in mind. If your browser is intentionally excluded from the VPN, it may continue using your regular connection.
2. Run a DNS leak test
A DNS leak test checks which DNS resolvers are handling your domain-name requests. DNS translates domain names such as example.com into IP addresses that computers can use. A VPN may provide its own DNS resolvers or use another configured DNS service.
A DNS leak may occur when requests that are expected to use the VPN’s DNS setup instead go through your regular network provider.
To test it:
- Disconnect the VPN and note the DNS servers shown by a reputable test.
- Connect to the VPN.
- Run the test again.
- Compare the DNS providers and server locations.
Don’t just look for your personal public IP in the results. DNS tests normally show DNS resolver addresses. Results can also differ when you intentionally use a custom DNS provider.
3. Perform a WebRTC leak test
WebRTC is browser technology used for real-time communication such as audio and video calls. A WebRTC leak test can help identify cases where browser networking exposes a public IP address you didn’t expect to appear.
- First, note your regular public IP with the VPN disconnected.
- Connect the VPN and then run a WebRTC testing tool.
If the test shows your regular public ISP address while your browser traffic should route through the VPN, review your browser and VPN settings.
You may also see local or private network addresses. A private local IP address is not the same as exposing your public ISP address.
Modern browsers use different privacy controls, so results can vary between browsers.
4. Check for IPv6 leaks
IPv6 is the newer version of the Internet Protocol. Some networks provide both IPv4 and IPv6 connectivity. A VPN may handle IPv6 directly or block it while connected.
A VPN leak test should therefore include both IPv4 and IPv6. Connect to your VPN and use an IP-testing service that displays both protocols. Check that your regular public IPv6 address does not appear unexpectedly.
If it does, try:
- Reconnecting to the VPN
- Trying another VPN server
- Updating the VPN application
- Checking IPv6 support in the VPN settings
- Contacting the VPN provider
Avoid changing advanced network settings unless you understand their impact.
5. Run a VPN speed test
Encryption and VPN routing add some processing and network overhead. This can reduce connection speed or increase latency. A VPN speed test helps you measure the difference.
Run one test without the VPN. Note:
- Download speed
- Upload speed
- Latency or ping
Connect to a nearby VPN server and repeat the test. For a fair comparison, use the same device, network, testing service, and test location.
VPN performance can change based on server distance, server load, VPN protocol, network congestion, device performance, and your original internet connection.
One test is not enough to judge overall performance. Run several tests at different times. You will find the speed test option in the Symlex VPN app.
6. Test the VPN kill switch
A kill switch blocks covered internet traffic if the VPN connection unexpectedly drops.
Start with the VPN connected and the kill switch enabled. Then disconnect the VPN in a controlled way without doing anything sensitive.
If the kill switch works as designed, covered internet traffic should stop instead of immediately switching to your normal connection.
Reconnect the VPN and confirm that internet access returns.
Kill switch behavior can vary by operating system and application. Some VPNs offer system-wide protection while others provide more limited controls.
7. Check connection stability
A VPN can connect but still perform poorly because of an unstable server or network.
Watch for:
- Frequent VPN disconnects
- Large latency changes
- Sites repeatedly failing to load
- Connections that constantly reconnect
- Unusual packet loss
- Very inconsistent speeds
Try a nearby VPN server and compare the results.
You can also change to another supported protocol inside the VPN app. Modern VPN services commonly offer protocols such as WireGuard, OpenVPN, or IKEv2/IPsec.
No protocol performs best on every network.
How to fix a VPN not working
If your VPN isn’t working, start with basic troubleshooting before changing advanced settings.
| Problem | What to try |
| VPN will not connect | Confirm your regular internet connection works |
| Slow VPN connection | Try another nearby server |
| Frequent disconnects | Restart the app and test another protocol |
| IP appears unchanged | Check split tunneling and reconnect |
| Unexpected DNS results | Check VPN DNS settings or contact support |
| App behaves incorrectly | Update or reinstall the VPN application |
| Connection conflicts | Check firewall or security software settings carefully |
Restarting your device or router may also solve temporary network problems.
Keep the VPN app and operating system updated. Updates often include compatibility, security, and connection fixes.
If the issue continues, contact the VPN provider’s support team instead of disabling important device security settings.
How to check if a VPN app is trustworthy
Connection tests tell you how the VPN behaves technically. They do not tell you everything about the provider itself.
Download VPN applications from the provider’s official website or a trusted app store.
Before choosing a service, review:
- Privacy policy
- Data collection practices
- Supported protocols
- Security features
- Company information
- App update history
- Independent security assessments, when available
Don’t assume every free VPN collects or sells user information. Privacy practices differ between providers, so check the actual policy.
Final words
Knowing how to check if a VPN is working takes more than looking at the connection button. Start by comparing your public IP. Then run a DNS leak test, IP leak test, WebRTC leak test, and IPv6 check.
A VPN speed test measures performance, while a kill switch test confirms what happens during a VPN disconnect.
If your VPN is not working as expected, troubleshoot the connection first. Check your network, VPN server, protocol, app version, and device settings.
Regular testing can help you understand how your VPN behaves without relying on exaggerated claims of complete anonymity, guaranteed security, or guaranteed speed.
FAQs
Check your public IP before and after connecting. You can also run an IP leak test, DNS leak test, IPv6 test, and WebRTC leak test.
It can. Encryption and additional routing create overhead. The difference depends on the VPN server, protocol, network quality, device, and server distance.
A VPN leak test checks if information expected to travel through the VPN is instead exposed through another network route. Common checks include IP, DNS, IPv6, and WebRTC tests.
Not necessarily. A changed IP confirms that some traffic uses a different public IP, but it doesn’t test DNS handling, IPv6, WebRTC, kill switch behavior, or every application.
Check your internet connection, try another nearby server, change to another supported VPN protocol, update the app, restart the device, or contact support.