To resolve ETABS license error #18 (typically appearing as "License Not Recognized! SentinelLM Error #18"), the most effective solution for ETABS 2021 (v19/v20) involves correcting the installation choice or manually linking the license server. Primary Fix: Change License Type During Installation
Windows often shuts down power to USB ports to save energy. This cuts the connection to your license dongle.
If error 18 occurs in a network license environment, additional steps may be necessary:
As noted in multiple technical forums, error 18 frequently resolves simply by . Common mistakes to avoid: etabs license error 18 2021
“Not without a new drive and a restore from backup. That’s a six-hour operation minimum. You’re stuck until morning.”
rather than "Use Network License" if you are using a standalone activation key. Check Date and Time
: SentinelLM licensing can fail if your system's date, time, or number format is incorrect. Try changing your PC's regional format to US (mm/dd/yyyy) Standalone License Activation To resolve ETABS license error #18 (typically appearing
She saved the file, emailed the PDFs to the site manager, and slumped in her chair. The sun was just beginning to turn the Chao Phraya River gold. She looked at the laptop’s clock. It still read .
Use the WlmAdmin.exe utility (found in the Sentinel RMS folder) to verify if the license is recognized and hasn't expired. If the expiration date has passed, you must renew the license through the CSI Customer Portal.
The following solutions are organized from least to most invasive. For users who obtained their software through official channels, begin with steps 1–4. For those who have exhausted standard troubleshooting methods, steps 5–7 provide additional options. This cuts the connection to your license dongle
A level.txt file tells ETABS which product level and version license to use. The file contains a single line specifying the product level and version number, such as:
The ETABS License Error 18 2021 is a licensing-related issue that occurs when the software is unable to validate the user's license. This error typically manifests as a pop-up message, indicating that the license is invalid or cannot be verified. The error code "18" specifically points to a problem with the license server or the way the software interacts with it.
If you suspect the lservrc file has expired:
Network licenses in use when upgrading the License Manager could become disconnected, causing client software to terminate. Close all client software during the upgrade process, even though this is not strictly required.
When network license search fails or network licenses are unavailable, the first thing to try is restarting the license manager service. This can be done via the License Manager Installation Folder or through Windows Services.