Sometimes, Windows Defender or third-party antivirus software views the license verification process as a threat and blocks it.
| Symptom | Likely Fix | | :--- | :--- | | Error appears only when working from home (VPN) | VPN is blocking the license port (2700). Contact IT. | | Error appears after a Windows Update | Run License Manager repair (Step 6) + Disable firewall. | | Error appears only for one user account | Run ETABS as Administrator (Step 2). | | Error says "No such feature exists" | Version mismatch (Step 5). | etabs license not recognized error 120