If the client machine cannot communicate with the server over the network, it will fail to recognize the license.
Go to Windows Control Panel > Programs and Features. Look for Sentinel RMS License Manager or Sentinel Protection Installer , right-click, and select Uninstall .
Navigate to the default installation directory: C:\Program Files\Computers and Structures\ETABS [Your Version]\ .
Did this error occur after a or a hardware change ? etabs license not recognized error 120 work
A missing or expired license file is the most frequent trigger for Error 120.
ETABS relies on "Sentinel" drivers to read the USB key. If these drivers are outdated or missing, Error 120 occurs.
The license file ( lservrc ) can become corrupted due to unexpected system shutdowns, disk errors, or conflicts with other software. CSI officially notes that a corrupted license file is one of the primary causes of licensing errors. If the client machine cannot communicate with the
If you are dealing with a complex corporate setup or an older environment, let me know you are running and whether you are deploying a standalone or network license so I can provide targeted troubleshooting steps! Share public link
In the world of CSI software licensing, "Error 120" generally refers to a communication failure between the ETABS application and the license manager. The software is trying to "check out" a license, but it cannot locate the valid file or the hardware key required to authorize the session.
If you have tried everything and the license is still not recognized, it is possible that the license file itself has expired, or the USB key has physically failed. ETABS relies on "Sentinel" drivers to read the USB key
tool to deactivate your current license and then reactivate it using your activation key. Check Date and Region Formats
Ensure your server administrator updates the Sentinel RMS License Manager whenever upgrading to a major new release of ETABS.
Paste your valid activation code to regenerate the local license file.