Etabs | License Not Recognized Error 120 Work Patched

The ETABS License Not Recognized (Error #120) typically indicates that the license file is incomplete or corrupted. This often occurs when a standalone license fails to validate against the machine's hardware profile or after an interrupted update. Core Resolution Steps

Check the lservrc File: Navigate to your ETABS installation directory (usually C:\Program Files\Computers and Structures\ETABS [Version]) and ensure the lservrc file is present. etabs license not recognized error 120 work

3. Check Firewall and Antivirus

• Temporarily disable firewall/antivirus and test.
• If resolved, add exceptions for:

  The lservrc file (if it exists) located in the main ETABS directory. The ETABS License Not Recognized (Error #120) typically

  • lmstat output shows expiry date and number of current users—ensure not expired or fully used.

  Clear Toolbar Conflicts: Sometimes local configuration files interfere with software startup. Search for and delete any *.tb2 files in the C:\Windows folder, then use Options > Reset Toolbars inside ETABS. Temporarily disable firewall/antivirus and test

  For detailed guides on specific versions, you can refer to the official CSI Knowledge Base or check support videos on Are you using a standalone license on a single PC or a license managed by a server?

  Common Causes

  • Corrupted or missing license file (lservrc or lservrc in the installation folder)
  • Security software (antivirus/firewall) blocking license communication
  • Outdated or incorrectly installed license manager (e.g., CSI License Manager)
  • Invalid or expired license (standalone or network)
  • Multiple network adapters interfering with license binding