When John launched Lumion 12 this morning, he was greeted with a frustrating error message: "Unable to contact the license server." He tried restarting the software, but the error persisted. He even checked his internet connection, thinking that maybe it was just a temporary issue, but nothing seemed to work.
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. When John launched Lumion 12 this morning, he
: A quick reset of your network configuration can resolve intermittent server connection failures. Running netsh winsock reset Administrator Command Prompt When John launched Lumion 12 this morning, he
If your license is not registered in a Lumion Account , you may encounter persistent connection errors starting from late 2025. When John launched Lumion 12 this morning, he