Note: Specific IP ranges are dynamic (Cloudflare-hosted). Always whitelist by domain, not IP.
If you have exhausted all troubleshooting options without success, contact Lumion Support directly. When reaching out, provide:
Ensure you aren't on a public Wi-Fi with restrictive blacklisting. Reset Mismatches CTRL + SHIFT Note: Specific IP ranges are dynamic (Cloudflare-hosted)
Click the Windows Start menu, type , right-click it, and select Run as administrator .
Overzealous security software can block Lumion's communication with the license server. When reaching out, provide: Ensure you aren't on
If you are using Lumion 12 or earlier and have never created a Lumion Account or registered your license, your installation may be unable to connect to the updated systems. Perpetual License Keys not connected to a Lumion Account may have trouble connecting to their updated servers after these changes are completed. This is a server-side change, meaning that even if your local system is configured correctly, an unregistered license will fail to authenticate.
Before diving into the fixes, it helps to understand why Lumion 12 suddenly loses access to its server. The software relies on specific ports and addresses to communicate with backup.lumion3d.net and license.lumion3d.net . If this path is broken, Lumion defaults to a secure, locked state. The most common culprits include: If you are using Lumion 12 or earlier
If you are using a VPN (NordVPN, ExpressVPN, Corporate VPN), disable it completely. Many VPNs block peer-to-peer or specific activation ports. Restart Lumion with the VPN off.
and register their Perpetual License Key there to ensure continued connectivity. Lumion Community forum Lumion Website to create an account.
Modern AV software like Bitdefender, Malwarebytes, or Avast use "Behavioral Analysis" to stop software from "phoning home," mistaking license checks for malware.