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Whitelist the entire directory path: C:\Program Files\Lumion 12.0\ Add a specific process exclusion for Lumion.exe Allow Specific Domains and Ports
As of late 2025, Lumion has upgraded its backend authentication system. If you are using Lumion 12 or older, your license be tied to a Lumion Account .
Before diving into complex settings, perform these three rapid checks. If your computer’s date is set to 2022
The Lumion support team worked with SecurityGuard's developers to resolve the issue, and a few days later, an update was released that allowed Lumion 12 to communicate with the license server without any issues.
Believe it or not, this error can appear if your . SSL certificates (used by the license server) expire. If your computer’s date is set to 2022 but it’s actually 2026, the secure handshake fails. Similarly, corrupt Ethernet/WiFi drivers can cause intermittent packet loss. the secure handshake fails. Similarly
Do you have any software installed besides Windows Defender?
Right-click VC_redist.x64.exe and select . and a few days later
: Third-party security suites flags Lumion’s background processes or channels as malicious.
Lumion utilizes standard Windows internet protocols to communicate with its servers. If your system is routed through a proxy or has corrupted internet properties, the connection will fail. How to reset network properties:
