Armin Šupuk

Software engineer and entrepreneur

Software

Security software from Armin Šupuk, the researcher who discovered Android's NAT-T keepalive VPN lockdown bypass. VPN Leak Guard detects and mitigates this fixed-signal exposure on supported devices and physical transports. To purchase a license, visit the payment portal. Already purchased? Use the license recovery form with the payment identifier shown on your purchase receipt to retrieve the license key attached to that order.

  1. VPN Leak Guard

    v2.0.54

    VPN Leak Guard is Android security software by Armin Šupuk, the researcher who discovered the Android NAT-T keepalive VPN lockdown bypass. It tests supported physical transports for exposure, reserves the known NAT-T keepalive slot while protection runs, and gives clear warnings and status guidance. Optional, consent-based research reporting helps map affected device and transport combinations. The mitigation covers this fixed NAT-T keepalive signal—not arbitrary traffic—and results remain device-dependent because keepalive slots and offload behavior vary by hardware, Android build, and transport. Read the technical disclosure.

    Package
    ch.supuk.vpnleakguard
    Author
    Armin Šupuk
    License
    Proprietary lifetime license
    Purchase
    One-time purchase
    Price
    €14.99 excl. tax
    Activation limit
    3 active device activations per license

    Sold as a paid one-time license. Review the Software License Terms and the Privacy Policy before purchase.

    Purchase and install

    Get VPN Leak Guard

    Purchase a lifetime license, then use Obtainium to track new releases or download the APK for a manual installation.

    1. License

    Up to three active devices.

    Lifetime license

    2. Install

    Choose update notifications or a manual download.

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    Update notifications
    Direct download APK
    Manual installation

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    • VPN Leak Guard overview showing protected NAT-T keepalive offload and QUIC connection-close payload checks.
    • VPN Leak Guard QUIC connection-close payload detail screen showing a protected result.
    • VPN Leak Guard NAT-T keepalive detail screen showing a protected result.
    • VPN Leak Guard NAT-T keepalive detail screen warning that a connection is actively bypassing the VPN.
    • VPN Leak Guard license management screen showing an active lifetime license.
    • VPN Leak Guard NAT-T keepalive detail screen showing active hardware-slot diagnostics.
    • VPN Leak Guard feature card showing the overview with protected NAT-T keepalive and QUIC connection-close checks.
    • VPN Leak Guard feature card explaining protection of the known NAT-T path across supported physical transports while protection runs.
    • VPN Leak Guard feature card showing an active warning when a connection bypasses VPN lockdown through the known NAT-T path.
    • VPN Leak Guard feature card showing a protected QUIC connection-close payload check.
    • VPN Leak Guard feature card showing lifetime-license management for up to three active devices.