: The firewall blocks Lumion's outbound or inbound connections.
Click in the left-hand sidebar.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
Security suites frequently flag Lumion's rapid outbound server pings as a false positive threat, isolating or blocking the software's network processes. : The firewall blocks Lumion's outbound or inbound
Click on . Look for any recently blocked Lumion dependencies and click Restore .
| 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. |
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. This link or copies made by others cannot be deleted
Change the file type dropdown in the bottom right from Text Documents ( .txt)* to .
Open the Control Panel and navigate to > Windows Defender Firewall . Click on Advanced settings on the left side of the window.
: Lumion upgraded its license authorization infrastructure, meaning unregistered old perpetual keys can cause activation errors if not linked to a central account. Step 1: Clean the Windows Hosts File Try again later
The error message means that the handshake failed. This is not a password issue; it is a network issue. The three primary causes are:
Change the file type dropdown menu in the bottom-right corner from Text Documents (*.txt) to . Select and open the file named hosts .
I can provide more targeted steps based on your specific setup. Share public link