The "Unable to find a license" error in is a common obstacle for structural engineers, typically stemming from communication gaps between the software and its licensing service. Whether you are using a standalone
setup, the issue generally relates to missing files, incorrect server paths, or hardware locking mismatches. 1. Root Causes and Error Mechanics Licensing in ETABS relies on the Sentinel RMS License Manager
. When the program starts, it scans local directories or the network for a valid file or a running license server. Communication Lag
: On networks, ETABS may time out before finding the server. Corrupted Registry
: Faulty installations can lead to "Error #0," where registry entries are mismatched. Hardware Changes : Licenses are often locked to a machine's Ethernet Address CPU Info String
. Reformatting a computer or changing hardware components can invalidate the existing license. Privilege Issues
: Windows User Account Control (UAC) may block ETABS from accessing the necessary registry keys or system folders if not run with Administrative privileges CSI Knowledge Base 2. Troubleshooting Standalone Licenses
For users with a single-user license, the software looks for the license file locally. Verify the : Ensure a file named
exists in the ETABS v18 installation folder. This file contains the encrypted authorization code. Check Locking Codes WechoID.exe
utility (found in the installation folder) to confirm that the machine's current locking code matches the one used to generate the license. Date/Time Sync
: Ensure your system date and time are accurate. A discrepancy can cause the Sentinel driver to reject the license. CSI Knowledge Base 3. Resolving Network License Failures
Network errors usually occur when the "client" (your PC) cannot find the "server" (the machine holding the licenses). The LMHOST.INI Fix unable to find a license etabs 18
: You can manually point ETABS to the server by creating a text file named LMHOST.INI
in the installation directory. Inside this file, simply type the Server Name IP Address of the license server. Firewall Exceptions Port 5093 (UDP)
is open on the server’s firewall, as this is the default port for Sentinel RMS communication. User Settings Folder
: If you lack admin rights to the installation folder, you can place your LMHOST.INI %LocalAppData%\Computers and Structures\ETABS 18 Thales Group 4. Summary of Common Error Codes
The "Unable to find a license" error in ETABS 18 typically occurs due to communication failures between the software and the license server, incorrect installation settings, or missing environment variables. Common Root Causes
Incorrect License Mode: Selecting "Network License" during installation when a "Standalone" license was intended can trigger Error #18.
Connection Latency: The software may time out while searching for the license server on a network.
Firewall Blocks: Communication ports 80 and 443 must be open for web-activated licenses to validate.
Missing System Drivers: Standalone licenses often require the Sentinel System Driver to recognize USB or Computer ID keys. Troubleshooting and Solutions
Activate, Deactivate or Renew a License - CSI Knowledge Base
Troubleshooting ETABS 18: "Unable to find a license" Encountering the "Unable to find a license" error in ETABS 18 is a common hurdle for structural engineers, usually occurring right after installation or a server update. Whether you are using a network or standalone license, //wiki.csiamerica.com/display/kb/Error+17+-+LM+servers+are+not+running">CSI Knowledge Base and CSI Community Support. 1. Fix for Network Licenses: The LMHOST.INI Method The "Unable to find a license" error in
If you are on a company network and ETABS cannot "see" the license server, you can manually point the software to the right location.
Create the File: Open Notepad and type the IP address or Name of your license server machine.
Save as: Save this file as LMHOST.INI. Ensure you select "All Files" in the save dialog so it doesn't end in .txt.
Placement: Copy the LMHOST.INI file into the ETABS installation folder (typically C:\Program Files\Computers and Structures\ETABS 18). 2. Verify Standalone License Locking Codes
If you have a standalone license, the software might not be communicating with your machine's hardware ID or USB dongle.
Check Computer ID: Run the wechoid.exe utility in the installation folder to see if your Computer ID is correctly recognized.
Update Drivers: If using a USB key and the ID is not visible, you may need to reinstall the Sentinel System Driver from the KeyDriver subfolder. 3. Use the CSi License Assistant
ETABS 18 includes a built-in tool called CSiLicenseAssistant to help you switch or reset license modes.
Location: Found in the CSiLicensing subfolder or your Windows Start Menu.
Action: Use it to verify if your "License Mode" is set correctly (e.g., Cloud, Standalone, or Network). If it's set to the wrong mode, ETABS will fail to find a valid license on startup. 4. System & Network Checks
This is the most common cause for engineers working remotely or on laptops. ETABS is configured to look for a license server at a specific IP address. If your network connection changes, the software gets lost. Check your VPN: Ensure your VPN is connected
The Scenario: You usually work in the office (Ethernet). You go home, connect to Wi-Fi, or turn on your company VPN. Now ETABS cannot find the license.
The Fix:
If you have a standalone license, ETABS uses a "Machine ID" generated from your hardware components (Hard Drive Serial, MAC Address, etc.).
The Problem: If you recently swapped a hard drive, updated your BIOS, or replaced a network card, your Machine ID has changed. The license file you have is bound to the old ID.
The Fix:
.lic file generated.In Windows 10 and 11, security protocols are strict.
The Fix:
Date: [Current Date] Software: CSI ETABS v18 (Build [Unknown]) Issue Category: Licensing / FlexNet
The prevalence of the "Unable to find a license" error is not a failure of CSI’s software engineering alone. It reflects a fundamental tension in the software industry: the need to protect intellectual property versus the user’s need for frictionless access. Floating network licenses, while flexible for organizations, introduce network dependency. Local licenses, while reliable for single users, are vulnerable to hardware failures. The FlexNet system, powerful as it is, is also complex and sensitive to system updates, antivirus patches, and network changes.
Moreover, ETABS 18 exists in a transitional period. CSI has since moved to a more modern licensing system (CSI Software Manager) for newer versions, which uses online authentication and is less prone to local network errors. However, many users remain on ETABS 18 because legacy projects are tied to it, or because their organization has not upgraded. These users are effectively stuck with an older, more brittle licensing architecture.
ETABS 18 stores a local license reference file that can become garbled.
Steps:
C:\ProgramData\Computers and Structures\ETABS 18\Licenses\Licenses.conf (or rename it to Licenses.old).