Lumion 12 Is Being Prevented From Contacting The License Server

| 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. |

: Security software often incorrectly flags Lumion’s connection as a threat. You should whitelist Lumion.exe and its installation folder in both your Windows Defender Firewall and any third-party antivirus. Check the Windows 'hosts' File | Cause | Description | |-------|-------------| | |

C:\Users\[YourUserName]\Documents\Lumion 12 . | | Hosts File Modification | The local