ETABS License Error #18 is typically related to an incorrect license type selection during installation or a mismatch between the software and the license server. Primary Causes & Solutions
Standard vs. Network License Conflict: This error often occurs if "Network License" was selected during installation when you actually possess a standalone (standard) license. To fix this, you may need to reinstall the software and ensure you select "Use Standard License".
HostID Mismatch: If you are using a network license server, Error 18 can indicate that the server's HostID has changed or does not match the information in the license file.
Sentinel RMS Issues: Like many CSI America products, ETABS relies on the Sentinel RMS License Manager. Ensure the service is running and that the LSHOST environment variable is correctly pointing to your license server. General Troubleshooting Steps
Check the Sentinel RMS Service: Open services.msc and verify that "Sentinel RMS License Manager" is running.
Verify the License File: Ensure your license file (usually lservrc) is in the correct directory (typically the ETABS installation folder) and has not expired.
Run as Administrator: Right-click the ETABS shortcut and select Run as Administrator to ensure the software has the necessary permissions to access license components.
License Manager Update: If you are using a network license, ensure you are running the latest version of the Sentinel RMS License Manager.
For official support, you can visit the CSI Knowledge Base or contact their technical support team.
License Error #18 in ETABS 2021 typically occurs when the software is unable to find a valid license, often due to configuration conflicts between network and standalone settings or issues with the Sentinel RMS license manager. Common Causes
Incorrect License Type Selection: Choosing "Use Network License" during installation when you actually have a standalone license (or vice versa) frequently triggers this error.
Corrupted Registry Entries: Installation errors or residual data from previous versions can corrupt the license registry paths.
Missing License Files: The lservrc file, which contains the actual license data, may be missing from the ETABS installation or CSiLicensing folder.
Native Image Conflicts: Issues with the .NET native image can sometimes interfere with the licensing handshake. Recommended Troubleshooting Steps
Verify Installation TypeIf you are seeing Error 18, check if you accidentally selected "Network License" during setup. If you are using a standalone key, you may need to reinstall and ensure "Standard/Standalone License" is selected instead.
Environment Variable Check (Network Users)For network licenses, ensure your PC knows where to look for the server: Open Environment Variables in Windows. Create a new System Variable named LSFORCEHOST or LSHOST. Set the value to your server's IP Address or PC Name.
Manual License PlacementEnsure the lservrc file is present. If you have a valid license file:
Copy it into the main ETABS installation directory (e.g., C:\Program Files\Computers and Structures\ETABS 2021). Also, place a copy in the CSiLicensing subfolder.
Reset Licensing ServiceIf the error persists, you can try to "clean" the licensing state: etabs license error 18 2021
Uninstall Native Image: Run a Command Prompt as administrator and execute ngen uninstall ETABS to remove potentially corrupt .NET native images.
Run as Admin: Always ensure you are launching ETABS and the activation tools with Administrative Rights.
Check Sentinel RMS UtilitiesUse 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.
For official support, you can refer to the CSI Knowledge Base or contact their licensing department with your Locking Code generated by the WechoID.exe tool. Error codes and descriptions - CSI Knowledge Base
ETABS License Error 18 typically indicates that a valid license code is unavailable for the requested feature. In ETABS 2021, this often stems from a mismatch between your system's locking code and the generated license file, or issues with system regional settings. Common Causes for Error 18
System Date/Number Format: The licensing tool often requires a specific date format to recognize the license properly.
Locking Code Mismatch: The machine-specific ID (HostID) used to generate the license may have changed or was incorrectly identified during setup.
Corrupted Registry Entries: Previous installations or failed updates can leave behind corrupted registry files that block new licenses. Recommended Fixes 1. Adjust Regional Settings
Many users find that changing the PC's date and number format resolves the issue. Go to Control Panel > Region. Set the format to English (United States). Ensure the date format is mm/dd/yyyy. 2. Verify Machine Locking Code
If the locking code used for your license doesn't match your actual machine code, Error 18 will persist.
Run the LicenseRequest file from the ETABS installation directory. Check the value against your license file (lservrc).
If they differ, you must regenerate the license using the correct code. 3. Perform a Clean Reinstallation
Corruption in the installation folder or registry can trigger licensing errors. Uninstall all previous versions of ETABS.
Delete the Computers and Structures folder from both C:\Program Files and C:\Local App Data.
Reboot your machine and reinstall ETABS as an Administrator. 4. Network License Troubleshooting (If Applicable) If you are using a network license:
Ensure the ls host environment variable is correctly set to your server's name.
Verify that ports 80 and 443 are open on your firewall to allow communication with the license manager.
For official technical support, you can visit the CSI Knowledge Base for detailed error code resolutions. ETABS License Error #18 is typically related to
Are you using a standalone or network license for your ETABS 2021 installation?
License Error #18 (typically 2019 or 2021) usually occurs during installation if the software is configured to use a Network License when it should be using a Standalone (Standard) License , or vice versa. Quick Fixes to Resolve Error #18 Change License Type during Reinstallation : If you are installing the software, ensure you select "Use Standard License"
instead of "Use Network License" if you are using a local key. Adjust System Date & Region Settings
: This error can be triggered by incompatible date formats. Go to your PC settings and change the Date/Number format US (mm/dd/yyyy) Sync System Time
: Ensure your computer's date and time are synchronized with an internet time server, as license validation often fails if there is a significant discrepancy. Clean Up Registry/Toolbars
: Sometimes residual files interfere with the license check. Search your C:\Windows folder for
files and delete them if present, then restart the software. CSI Knowledge Base Additional Troubleshooting Steps
If the issue persists, the following steps are recommended by users on CSI Knowledge Base Run StandaloneKey.exe
: Locate this file in the installation directory and run it as an Administrator to refresh the local license file. Verify HostID
: Ensure your hardware's HostID hasn't changed (e.g., due to a new network card or motherboard), as the license is often locked to specific hardware. Check for "Nulled" Software Issues
: If using an unofficial version, the error may be due to a broken bypass or "crack" that intercepts license requests. It is recommended to use official sources from CSI America to avoid these stability and security risks. BricsCAD Help Center or a link to the CSI Support contact page? Licensing errors generated when running CSI software 7 Jul 2025 —
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
If you encounter Error 18 immediately after installation, it is often because you selected "Network License" when you should have selected "Standalone" (or vice versa). ETABS completely and your machine to clear corrupted registry entries. Restart the installation When prompted for the license type, ensure you select "Use Standard/Standalone License"
instead of "Use Network License" if you are not using a centralized license server. CSI Knowledge Base Fix for Network Users: Create an LMHOST.INI File
If you are legitimately using a network license and getting Error 18, your machine likely cannot locate the license server. www.csicertifications.us and type the IP Address Computer Name of the machine hosting the license. File > Save As Name the file LMHOST.INI and set "Save as type" to All Files (
Copy this file into the ETABS installation directory (typically C:\Program Files\Computers and Structures\ETABS 2021 Additional Troubleshooting Steps Deactivate/Reactivate : Use the menu Help > License Information > Change Activation Key
to deactivate and then reactivate your license if it was partially recognized. Sentinel Upgrade : Ensure your server is running Sentinel RMS License Manager v9.2
or later, as versions older than v8.6 will not recognize ETABS 2021 licenses. Environment Variable Step 2: Update the Vendor Daemon (CSiBridgeDaemon) Even
: You can also force a connection by creating a Windows System Variable named with the value set to your server's IP address. Quick Reset
: If the error occurs randomly, try closing ETABS through the Task Manager
and restarting it; sometimes an infinite error loop can be broken this way. CSI Knowledge Base Open in app - CSI Knowledge Base
ETABS "License Error 18" is a common technical hurdle for structural engineers using the 2021 release (often associated with versions like ETABS v18 or v19). This error typically signifies that the software cannot find or recognize a valid license. The "ETABS License Error 18" Experience
For most users, this error occurs immediately upon launching the application, preventing any work on structural models. According to the CSI Knowledge Base, it can affect both standalone and network licenses. Primary Causes:
Mismatch in Locking Codes: The locking code of your machine does not match the one in the license file.
Registry Corruption: Corrupted registry entries during installation often trigger this error.
Date/Time Sync: If the PC date or number format is incorrect, it can cause authentication failures. Community-Tested Solutions
User reviews and forum discussions from CivilEA and YouTube suggest several fixes that vary depending on your setup:
Check Date Format: Changing the system date/number format to US (mm/dd/yyyy) has resolved the issue for many users.
Native Image Generation: During installation, disabling the "Perform native image generation" option is a recommended step to avoid conflicts.
Run as Administrator: Ensuring you have full administrative rights when running the CSiLicenseAssistant can bypass some permission-related blocks.
Re-installation Strategy: The most reliable "brute force" fix involves completely uninstalling the software, running a Microsoft FixIt tool to clean registry entries, and then performing a clean install.
License Error 18 in ETABS (or any CSI software like SAP2000 and SAFE) typically means "The server is down or not responding."
Essentially, your computer knows where the license should be (the Server Name/IP is correct), but it cannot communicate with the server computer to actually borrow the license.
Here is a step-by-step guide to troubleshooting and fixing this error for the 2021 version.
Even if lmgrd is new, the vendor daemon (CSiBridgeDaemon.exe or similar) might be stale. ETABS 2021 looks for a specific feature signature.
Action:
.exe files (lmgrd, lmutil, and the vendor daemon) with the versions from the ETABS 2021 installation package.We will proceed from simplest (no admin rights needed) to most complex (IT-level intervention).
LSERVRC variable points to correct file.