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Solving the "Lumion 12 is being prevented from contacting the license server" error typically requires fixing a block in your Windows Hosts file or adjusting your Firewall settings.

John contacted the Lumion support team, reporting the issue and providing details about the problem. They were grateful for his thorough investigation and confirmed that the issue was indeed related to SecurityGuard.

Aggressive antivirus software often flags Lumion's licensing pings as suspicious activity. Creating strict exclusions ensures your security software lets Lumion pass through unhindered. Add a Folder Exclusion

Why this matters

Antivirus: Add an exclusion for the entire Lumion installation folder (typically C:\Program Files\Lumion 12.0) in your antivirus software.

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