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Lumion requires access to the following domains and ports:
Your built-in Windows Firewall might be blocking Lumion's outbound connection. You need to create an exception to allow it through. How to allow Lumion through the firewall:
Imagine this: You have a project deadline looming in 48 hours. You’ve just finished modeling a complex architectural scene. You open Lumion 12, ready to render the final walkthrough, when suddenly—a popup stops you cold:
Time was bleeding away. 11:00 PM. 12:00 AM.
Corrupted network routing data or outdated DNS caches can prevent your computer from finding the correct path to the Lumion server. Lumion requires access to the following domains and
When Lumion 12 launches, it sends a verification ping to official validation domains (like https://license.lumion.com ) via standard web ports. If that signal is blocked or redirected, the software triggers a security shutdown. The primary culprits behind this behavior include:
: Click on Allow an app or feature through Windows Defender Firewall on the left-hand panel.
If Lumion is not on the list, click , browse to your Lumion installation directory (usually C:\Program Files\Lumion 12.0\ ), select Lumion.exe , and click Add . Click OK to save changes. 3. Exclude Lumion from Antivirus Scanning
Phase 2: Solving Firewall and Antivirus Blocks (Most Common) 12:00 AM
How to Fix "Lumion 12 Is Being Prevented from Contacting the License Server"
Port 80 (HTTP) and Port 443 (HTTPS) must be open for bidirectional traffic. Primary Domains to Whitelist: *.lumion3d.net *.lumion.com *.act-3d.com 5. Disable VPNs and Proxy Servers
Did this guide help you? If you found a unique fix not mentioned here regarding a specific ISP or VPN, share it in the comments below to help the Lumion community.
The most common cause of this error is a modified Windows Hosts file. If the file contains lines that redirect Lumion's web addresses, the software will never reach the official servers. implement these baseline configurations:
Occasionally, your computer saves an old path to the Lumion server (DNS cache) that is no longer correct. Flushing the DNS cache forces your computer to find the correct server address again.
Before diving into the solutions, it's essential to understand the possible causes of the issue:
To avoid running into licensing communication issues in the future, implement these baseline configurations:
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ADA CERP is a service of the American Dental Association to assist dental professionals in identifying quality providers of continuing dental education. ADA CERP does not approve or endorse individual courses or instructors, nor does it imply acceptance of credit hours by boards of dentistry. This continuing education activity has been planned and implemented in accordance with the standards of the ADA Continuing Education Recognition Program (ADA CERP) through joint efforts between Tribune Group GmbH and Dental Tribune International GmbH, recognized through ADA CERP from 5/1/24 - 6/30/27.