Etabs License Not Recognized Error 120 top -

The "License Not Recognized Error 120" in ETABS typically occurs when the software cannot communicate with the Sentinel RMS License Manager or find a valid license file. This issue is common after Windows updates, server migrations, or changes to network configurations.

Follow these steps to resolve the error and get back to your structural modeling. Check the LSHOST File

The most common cause is ETABS looking in the wrong place for its license.

Navigate to the ETABS installation folder (usually C:\Program Files\Computers and Structures\ETABS [Version]). Locate a file named LSHOST.txt. Open it with Notepad.

Delete any existing text and type the IP address or Host Name of the license server. If you are using a standalone license, type localhost. Save the file and restart ETABS. Verify the Sentinel RMS License Manager

If you are using a Network License, the service on the server might have stopped.

On the Server: Open "Services" (type services.msc in the Start menu). Locate: Find "Sentinel RMS License Manager."

Action: If it’s not running, click Start. If it is running, click Restart.

Check Tools: Use the WlmAdmin.exe tool to see if the ETABS licenses are visible and not expired. Adjust Windows Firewall Settings etabs license not recognized error 120

Firewalls often block the communication port used by CSI software.

Ensure UDP Port 5093 is open on both the server and the client workstation.

Add an exception for the Sentinel RMS License Manager executable (lservnt.exe).

Temporarily disable the firewall to test if the error disappears. Set Environment Variables

Manually pointing Windows to the license server can bypass local configuration glitches.

Right-click This PC > Properties > Advanced System Settings. Click Environment Variables. Under System Variables, click New. Variable Name: LSFORCEHOST Variable Value: Enter your server's IP address or hostname. Restart your computer. Re-run the Leveling Tool

Sometimes the internal "license level" (e.g., Ultimate, Plus, or Standard) gets reset.

In the ETABS installation folder, look for CSiLicensing.exe or LicenseRequest.exe. Run the tool as Administrator. The "License Not Recognized Error 120" in ETABS

Ensure the correct product level is selected to match your purchased license.

💡 Quick Tip: If you recently updated Windows, your "Computer ID" or "Locking Code" might have changed. If the steps above fail, generate a new request file via the License Management Tool and contact CSI Support for a license reactivation. To help you fix this faster, let me know: Your ETABS version? Using a Network or Standalone license?

User Sentiment (Compiled from Support Forums)

Frustration level: High – Error 120 often appears without warning after a Windows update or network change.
CSI support responsiveness: Mixed – Users report that CSI Support is helpful but slow for urgent cases.
Workarounds: Some users downgrade to an older ETABS version or switch to a standalone USB dongle to avoid network license issues altogether.

Step 6: Repair the Licensing Service

If none of the above works, the licensing driver itself might be corrupt.

Go to Control Panel > Programs and Features.
Find "CSI License Manager" (not ETABS).
Right-click and select Repair.
Reboot your machine.

Solution 2: Check Hardware Key Connections (USB Dongles)

If you are using a physical red or purple USB key, the issue might be physical.

Swap Ports: Move the key to a different USB port. Preferably use a USB 2.0 port if you are having issues on a USB 3.0 port (and vice versa).
Check Device Manager:
- Right-click the Start button and select Device Manager.
- Look for "Universal Serial Bus controllers".
- Expand it and look for "SafeNet USB SuperPro/UltraPro". If you see a yellow exclamation mark, right-click it and select "Update Driver" or "Uninstall Device" and reboot to force Windows to reinstall it.

Common Causes

Network License Server Issues
- The license server machine is down, unreachable, or firewalled.
- The CSI License Manager service is not running on the server.
Incorrect License File or Path
- The lservrc or license file is missing, renamed, or contains invalid data.
- ETABS is looking for the license in the wrong directory (e.g., after a software update or reinstall).
Version Mismatch
- The installed ETABS version is newer than what the license file supports.
- The License Manager (LMServer) is outdated and does not recognize the feature code for your ETABS version.
Port Blockage
- The default CSI port (e.g., 27000) is blocked by Windows Firewall, antivirus, or network policies.

Fixing the “License Not Recognized (Error 120)” in ETABS: A Step-by-Step Guide

Few things are more frustrating than sitting down to meet a tight deadline, launching ETABS, and being greeted by the dreaded “License Not Recognized (Error 120)” message.

This error essentially means that the Licensing Service (usually the Computers and Structures, Inc. (CSI) License Manager) cannot communicate with your license file or server. Before you panic and reinstall everything, know that this is a common issue with a straightforward fix.

Here is your complete guide to diagnosing and resolving Error 120 in ETABS.

Step 1: The "Grand Restart" – 30 Seconds That Save Hours

Before editing files, perform a full reset of the licensing chain.

Close ETABS completely.
On the license server computer (not your local PC), open Services.msc (Run → services.msc).
Find the service named Sentinel RMS License Manager or Sentinel RMS Server.
Right-click it and select Stop.
Wait 30 seconds. Right-click again and select Start.
On your local computer, restart your machine.
Try launching ETABS again.

Why this works: Licensing services can hang. A full restart forces the license manager to re-read the license file and clear temporary connection states.

Step 2: The "Run as Administrator" Fix (Standalone Licenses)

If you are using a standalone (local) USB dongle or software license on a single machine, Windows permissions are often the culprit.

Solution: Right-click the ETABS shortcut and select "Run as Administrator." Do this even if your user account is an Admin.

If that works permanently, go to Properties > Compatibility > Check "Run this program as an administrator" for the ETABS shortcut.

A Quick Troubleshooting Cheat Sheet

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