Open the following file: C:\Windows\System32\drivers\etc\hosts . that contain the word "lumion".
Corrupted internet routing tables can prevent your computer from finding the correct path to the Lumion network.
| Cause | Description | |-------|-------------| | | Windows Defender Firewall or a third-party firewall (Norton, McAfee, Kaspersky) is blocking Lumion12.exe or Lumion12_64.exe from outbound TCP port 443 (HTTPS) or port 80 (HTTP). | | Antivirus / Web Security | Real-time web protection or “HTTPS scanning” is intercepting and blocking Lumion’s license validation traffic, mistaking it for suspicious behavior. | | Corporate / School Network Restrictions | IT policies block connections to non-whitelisted domains, especially gaming or 3D rendering license servers. | | Hosts File Modification | The local C:\Windows\System32\drivers\etc\hosts file contains an entry redirecting or blocking Lumion’s license server domains. | | Proxy Server Required | The network requires an authenticated proxy, but Lumion 12 does not support system proxy settings natively in all builds. | | DNS Failure | Lumion’s license server domain names cannot be resolved due to DNS filtering or misconfiguration. |
"This is Elias at Studio Arcadia. I need a port exception opened. Port 8080 and 443, specifically for the Lumion verification IP range." | Cause | Description | |-------|-------------| | |
Windows may block inbound or outbound traffic for newly installed or updated versions of Lumion without notifying you.
Navigate to your primary Lumion installation directory (typically C:\Program Files\Lumion 12 ) and click . Check Protection History:
Repeat this exact process under the section to ensure two-way communication. 4. Whitelist Specific Licensing Domains and Ports | | Hosts File Modification | The local
How to Fix "Lumion 12 is being prevented from contacting the license server"
. This ensures the software has the necessary permissions to use your network adapter and system files. When to Seek Further Help
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: If that handshake is interrupted
: Close the command prompt and restart your PC to clear all network caches completely. 5. Disable Proxy Servers and VPNs
This comprehensive troubleshooting guide breaks down why this network interruption happens and provides detailed, step-by-step instructions to restore your Lumion 12 connection. Core Causes of the Connection Block