Common VPN Mistakes and How to Avoid Them

Introduction: Why VPN Doesn’t Always Protect

A VPN is a key tool for ensuring privacy and security online. However, even when using a VPN, users encounter issues that undermine the technology’s benefits. The main mistakes—outdated software, incorrect settings, and hardware issues—lead to data leaks and reduced speed.

In this article, we’ll explore typical VPN usage errors and explain how to avoid vulnerabilities in protecting your personal data.

Mistake #1: Using an Outdated VPN Client

One of the most common problems is ignoring updates for the VPN app. Providers regularly release updates to fix vulnerabilities and optimize connections. For example, Surfshark in 2026 rolled out an update that increased connection stability by 15% and reduced data usage by 10%.

Why Updates Matter

• Improved security: fixing known vulnerabilities
• Performance optimization: boosting connection speed
• Compatibility with new systems and protocols

Ignoring updates leads to connection errors like codes 600, 609, and 637, which often indicate compatibility issues or outdated certificates.

Mistake #2: Conflicts with Firewalls and Antivirus Software

Many VPN connections are blocked by local firewalls or antivirus programs, causing errors such as 809—an inability to connect to the VPN server. This results from traffic filtering and port blocking.

How to Solve the Problem

• Temporarily disable the system firewall or configure exceptions
• Add the VPN app to the antivirus trusted programs list
• Use VPNs that support NAT and firewall bypass

Microsoft recommends configuring Windows Defender Firewall rules on Windows Server to allow VPN traffic, which reduces error 809 instances by 70%.

Mistake #3: Choosing Free VPN Services

Slow speeds and poor connection quality are often caused by using free VPNs. Free services limit server selection, use weak encryption, and may display intrusive pop-ups urging paid subscriptions.

In 2026, ESET noted that free VPNs typically reduce connection speeds by 40-60%, making them impractical for high-traffic tasks like streaming or online gaming.

Recommendations for Choosing a VPN

• Opt for paid VPNs with transparent security policies
• Evaluate server count and geographic coverage
• Look for modern encryption protocols like WireGuard

Mistake #4: Incorrect VPN and Encryption Settings

Sometimes users disable data encryption in VPN settings to increase speed, which drastically lowers security. This can lead to traffic leaks and identifiable data exposure.

For example, in the Sunlink VPN client settings, there’s an option «Disable Data Encryption,» which many mistakenly turn off to speed up the connection, but end up exposing themselves to risk.

Best Configuration Practices

• Always use the encryption protocols recommended by your provider
• Do not disable protection features for speed
• Check security settings after app updates

Mistake #5: Ignoring Connection Warnings and Errors

Many users overlook system notifications and VPN app warnings, worsening problems. Errors with codes 601, 603, or 618 often indicate network issues or incorrect server parameters.

Restarting the device and reinstalling the VPN client resolves such errors in 75% of cases, according to Microsoft technical support.

What to Do When Errors Occur

• Carefully read error messages
• Restart your computer and router
• Reinstall the VPN client from the official site
• Contact your provider’s support service

• 15% — increase in connection stability after VPN update (Surfshark, 2026)
• 70% — reduction in error 809 with proper firewall configuration (Microsoft, 2026)
• 40-60% — speed drop when using free VPNs (ESET, 2026)
• 75% — effectiveness of restart and reinstall for fixing errors (Microsoft, 2026)

Frequently Asked Questions

Key Takeaways

• Regularly update your VPN client to improve security and stability.
• Configure your firewall and antivirus for proper VPN operation.
• Avoid free VPNs if speed and data protection matter.
• Don’t disable encryption for speed—it compromises security.
• Pay attention to VPN errors and warnings to fix issues promptly.

Conclusion

A VPN is a powerful tool for protecting personal data, but only when used correctly. Avoiding common mistakes like using outdated software, incorrect settings, or low-speed free services can significantly enhance security and online comfort. Careful attention to updates, settings, and service quality will help preserve privacy and prevent vulnerabilities in 2026 and beyond.