Lumion 12 Is Being Prevented From Contacting The License Server //top\\
Paste the following path into the file name bar and hit Enter: C:\Windows\System32\drivers\etc\
Change the file type dropdown in the bottom right from Text Documents ( .txt)* to . Select and open the hosts file.
Windows Firewall might be silently blocking Lumion. We need to create an explicit "Allow" rule. Paste the following path into the file name
April 21, 2026 Category: Troubleshooting / Technical Support Reading Time: 4 minutes
Overzealous third-party security suites often isolate Lumion's communication channels. If you use software like Avast, Bitdefender, Norton, or Kaspersky, you must add structural exclusions. Add File and Folder Exclusions We need to create an explicit "Allow" rule
This error typically appears during startup, license validation, or when trying to access online content. The good news? It is almost always a local network or security configuration issue—not a problem with your license key.
: Leftover lines from cracks, secondary installations, or security suites redirect Lumion's lookup queries to dead local loops. Add File and Folder Exclusions This error typically
Open Command Prompt as Admin and type ipconfig /flushdns , then hit Enter. This clears old connection data.
Change the file type dropdown from Text Documents (*.txt) to . Select and open the file named hosts . Scan the document for any lines containing the word lumion . Delete all lines that mention Lumion. Save the file and close Notepad. 🛡️ Step 2: Configure Antivirus and Windows Defender
