A modified "hosts" file can explicitly block Lumion's server access. as an Administrator. Open the file located at: C:\Windows\System32\drivers\etc\hosts Look for any lines containing the word those lines and save the file. 4. Verify Necessary Domains and Ports
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Open by right-clicking it and selecting Run as administrator . Must have Admin privileges. 2
Before diving into standard troubleshooting, it's essential to address the single most important change affecting older Lumion versions. Act-3D, the developer of Lumion, has been systematically upgrading their licensing authentication infrastructure to improve security and support new services like Lumion Cloud. A modified "hosts" file can explicitly block Lumion's
Add an exclusion for the entire Lumion installation folder (typically C:\Program Files\Lumion 12.0 ) in your antivirus software.
Go back to and scroll down to select Manage settings .
Before we dive into the troubleshooting guides, let's examine the possible causes of the error in more detail: If you share with third parties, their policies apply
Lumion relies on a constant internet handshake to verify your digital license key when launching and running the application. If that handshake is interrupted, the software locks up to prevent unauthorized use. The most common causes of this breakdown include:
Find Lumion in the list and ensure both and Public checkboxes are ticked.
while double-clicking the Lumion icon and keep holding them for 30–60 seconds until the program launches. Do you have a third-party antivirus (like Bitdefender or Norton) installed, or are you using Windows Defender How do you resolve antivirus and firewall problems? and add it.
If Lumion is not on the list, click , browse to Lumion.exe in your installation folder, and add it. Network Domains to Whitelist
A corrupted or modified hosts file can redirect license server requests to nowhere.