. This error typically occurs because Lumion's license server check is being blocked by local network redirects. Steps to Fix the Hosts File Open Notepad as Administrator Windows key , right-click it, and select Run as administrator Locate the Hosts File In Notepad, go to File > Open Navigate to: C:\Windows\System32\drivers\etc\ Ensure the file filter (bottom right) is set to All Files ( so you can see the file named Clean the File Find any lines containing the word 127.0.0.1 backup.lumion3d.net these lines entirely. Save and Restart Save the file (ensure it does extension). Restart Lumion 2023. Additional Troubleshooting Antivirus Exclusions : Add an exclusion for Lumion.exe
Test cases
Follow these exact steps to remove the conflicting entries and get Lumion running again: 1. Open Notepad as Administrator Because the lumion 2023 host file entries detected exclusive
Always try launching the Lumion executable as an administrator to ensure it has the necessary permissions. Save and Restart Save the file (ensure it does extension)
The error (or similar "hosts file" warnings) typically triggers when the software's security protocols identify manual modifications to the Windows hosts file. These modifications often block communication with Lumion's authentication servers , preventing the application from verifying its license or launching correctly. Understanding the Error Open Notepad as Administrator Because the Always try
The hosts file is a local text file that maps hostnames to IP addresses. It overrides DNS settings. Common "Blocked" Entries: 127.0.0.1 backup.lumion3d.net 127.0.0.1 license.lumion3d.net 127.0.0.1 act-u8-wb.lumion3d.net 127.0.0.1 act-u8-oy.lumion3d.net
