Etabs License Not Recognized Error 120 Work [LATEST]

ETABS License Not Recognized: How to Fix Error 120 for Good

Error 120 is one of the most frustrating roadblocks for structural engineers using CSI Software (ETABS, SAP2000, SAFE). Unlike generic "license not found" errors, Error 120 specifically indicates a communication breakdown between the ETABS Licensing Service and the Sentinel RMS (License Manager) Server.

In simple terms: Your computer knows a license should exist, but it cannot verify it due to port conflicts, corrupted configurations, or Windows services that have stopped working. etabs license not recognized error 120 work

Below is a comprehensive, step-by-step guide to diagnosing and resolving "ETABS License Not Recognized Error 120" permanently. ETABS License Not Recognized: How to Fix Error

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3. Client-Side Configuration

On Your computer (the Client):

• Open ETABS.
• When the license error pops up, look for a "Server" or "Settings" button in the error dialog box.
• Ensure the Server Name/IP Address is typed correctly. It should match the name or IP of your company server.
• Pro Tip: If you recently changed Wi-Fi networks (e.g., switched from Office Wi-Fi to VPN or Ethernet), the IP address of the server might be different.

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7. Reinstall ETABS with License Manager

• Uninstall ETABS and CSI License Manager
• Restart PC
• Reinstall ETABS (choose “Standalone” or “Network” correctly during setup)

2. The Sentinel Driver Issue (Most Common Cause)

ETABS relies on "Sentinel" drivers to read the USB key. If these drivers are outdated or missing, Error 120 occurs. Open ETABS

• The Fix: Open your ETABS installation folder (usually C:\Program Files\Computers and Structures\ETABS XX).
• Look for a folder named Sentinel or System.
• Inside, find a file named something like Setup.exe or Sentinel System Driver Installer.exe. Run this installer as Administrator.
• Restart your computer.

Troubleshooting checklist (quick, ordered)

1. Restart license service
   • On license server: restart FlexNet/CADLM service (LMTOOLS or Services.msc).
2. Check status with lmstat
   • Run lmutil lmstat -a (or LMTOOLS) on license server to confirm licenses available and server host ID.
3. Verify license file hostID
   • Confirm license file’s HOST or SERVER entry matches server MAC/host ID exactly. Use “lmutil lmhostid” or OS tools (ipconfig /all / ifconfig -a).
4. Confirm client points to server
   • On client, check LICPATH.LIC or LM_LICENSE_FILE: should be SERVER=<hostname_or_IP>: or path to valid license file.
5. Test network connectivity
   • Ping server by hostname and IP. Telnet (e.g., telnet server 27000) to ensure port reachable.
6. Check firewall/antivirus
   • Temporarily allow the license port through firewall on server and client; whitelist FlexNet executables.
7. Resolve name/DNS issues
   • If hostname fails, use IP in LM_LICENSE_FILE; or add server hostname→IP in clients’ hosts file.
8. Search for duplicate license managers
   • Uninstall/disable other licensing services; ensure only correct version running.
9. Check license expiry/usage
   • lmstat output shows expiry date and number of current users—ensure not expired or fully used.
10. Verify permissions and file integrity
    • Ensure license file readable by license service account; no extra characters/line breaks introduced.
11. Sync clocks
    • Ensure server and clients have correct system time (use NTP).
12. Review vendor/ETABS logs
    • Check FlexNet debug/log files and ETABS license error logs for specific error text and timestamps.
13. If server is virtualized
    • Confirm hostID used to create license matches current VM/host NIC; some vendors require a physical MAC.

3. Check Firewall and Antivirus

• Temporarily disable firewall/antivirus and test.
• If resolved, add exceptions for:
  • lserv.exe (license manager)
  • ETABS.exe
  • Port 27000 (default TCP port for CSI licensing)

How to check:

1. Open Command Prompt as Administrator.
2. Run: netstat -ano | findstr :1947
3. If any process shows LISTENING, note the PID (last column).
4. Run: tasklist | findstr <PID> to identify the conflicting program.
5. Either uninstall that program or reconfigure it to use a different port.

To change the ETABS license manager port:

• Edit C:\Program Files (x86)\Common Files\SafeNet Sentinel\Sentinel RMS License Manager\wlmadmin\wlm.ini
• Change Port=1947 to another value (e.g., 1948), then restart the service.

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The "Last Resort" Fix: Clean Reinstall

If none of the above works, the installation itself is likely corrupted. Here is the clean way to fix it:

1. Uninstall: Go to Control Panel > Programs and Features. Uninstall ETABS and CSI License Support.
2. Clean Registry (Advanced): Use a registry cleaner (like CCleaner) or manually search the registry for "Computers and Structures" keys under HKEY_CURRENT_USER\Software and delete them. Note: Only do this if you are comfortable with RegEdit.
3. Delete Folders: Delete the main installation folder in Program Files.
4. Reinstall: Install ETABS from scratch, ensuring you select the option to install License Support during the setup wizard.

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