Etabs License Not Recognized Error 120 [ REAL ]

If you've completed all seven steps and still see "ETABS License Not Recognized Error 120," it's time to escalate. Contact CSI Technical Support or your local distributor.

Before you call, have this information ready:

For network licenses, ETABS needs to know where the server is. If the path is wrong, you get Error 120.

Fix: Ensure the server name is spelled correctly. Try replacing the computer name with the IP address (e.g., 2700@192.168.1.10).

Before touching any settings, confirm that your license server is actually running. etabs license not recognized error 120

If you don't see the icon: Go to Start Menu > CSI Licensing > License Manager (Start).

| Step | Action Taken | Result | |------|--------------|--------| | 1 | Restarted ETABS and computer | Error persisted | | 2 | Verified that CSI License Manager service is running (services.msc) | Service was [running / stopped / missing] | | 3 | Checked firewall rules for ETABS and lmgrd.exe | [Blocked / Allowed] | | 4 | Temporarily disabled antivirus software | Error [resolved / persisted] | | 5 | Verified license file (lservrc) exists in C:\ProgramData\CSI\Licenses\ | File [present / missing] | | 6 | Checked USB hardware key (if applicable) | Key [detected / not detected] | | 7 | Ran ETABS as Administrator | Error [resolved / persisted] | | 8 | For network license: Pinged license server IP | [Successful / Failed] |

This is a niche fix for computers that intermittently lose network connection or use VPNs. Installing a Microsoft Loopback Adapter creates a virtual, permanent network card. The license binds to this adapter, so it never "changes."

For structural engineers, ETABS (Extended Three-dimensional Analysis of Building Systems) is the gold standard for building analysis and design. However, few things are as frustrating as sitting down to meet a deadline, launching the software, and being greeted by the dreaded "Error 120: The license is not recognized by the license server." If you've completed all seven steps and still

This error effectively locks you out of your work. It indicates a breakdown in communication between your computer (the client) and the machine holding the license (the server—either a physical computer in your office or a cloud-based license manager).

Don't panic. In 90% of cases, Error 120 is not a license revocation but a network or configuration issue. This comprehensive guide will walk you through what Error 120 means, why it happens, and—most importantly—how to fix it permanently.

If you are running a newer version of ETABS (v18, v19, 20, or 21), CSI changed how the licensing service runs in the background.

Restarting this service forces the computer to "re-read" the license file, which often clears Error 120 immediately. Fix: Ensure the server name is spelled correctly

This is the fix for 70% of Error 120 cases. You must ensure that your license supports your ETABS version.

How to check:

Solution: Uninstall the newer ETABS and install the version your license supports, OR contact your distributor to upgrade your license.