Lumion 12 Is Being Prevented From Contacting The License Server [exclusive]

By systematically working through this guide—starting with Windows Firewall whitelisting, then moving to DNS flushing and antivirus exclusions—you will resolve the issue in under 10 minutes.

followed by a PC reboot often clears "General connection failure" errors. Run as Administrator : Right-click the Lumion shortcut and select Run as administrator : Click Change settings , find Lumion

If you are working in a corporate office, your company’s internal network may be preventing the handshake. The security was too strong for the license to get out

: Click Change settings , find Lumion.exe in your installation folder, and ensure both "Private" and "Public" are checked. : Click Change settings

He wasn't running a VPN, but the network’s new security suite was acting like one, masking the local IP in a way the license server viewed as suspicious. It was a digital Catch-22. The security was too strong for the license to get out.

If your machine is behind a strict corporate network or a specialized third-party firewall, Lumion will not be able to ping its validation database. Allow Lumion Through Windows Firewall