License Error 18 – The license file and/or key is not found. Please check your license configuration.
For standalone licenses, try deactivating and then reactivating the license through the CSiLicensing tool . :
For official technical support, you can visit the CSI Knowledge Base for detailed error code resolutions. etabs license error 18 2021
If you are a structural engineer who has worked with CSI software over the last few years, you have likely encountered the notorious . While error codes are commonplace in software licensing, the specific combination of ETABS, Error 18, and the 2021 version has become a recurring nightmare, especially for firms managing hybrid (local/network) licenses or those who recently upgraded their operating systems.
If the service starts but then stops immediately, proceed to Phase 3 (port conflict). License Error 18 – The license file and/or
The is frustrating primarily because it masks a simple problem—a stopped service, a blocked port, or corrupted cache—behind a cryptic number. By systematically working through the phases above, 99% of cases are resolved.
This forces ETABS 2021 to communicate only with the updated daemon, bypassing any legacy daemon on port 27000. : For official technical support, you can visit
Create a plain text file named LMHOST.INI in the ETABS installation folder. Inside, type the IP address or name of the license server. This helps the software bypass network discovery issues. ✅ Summary
The ETABS License Error 18 2021 typically occurs when the software is unable to validate the license, preventing users from accessing its features. The error message may appear as: