Etabs License Error 18 2021 Patched Official

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. etabs license error 18 2021

Step 3 – Disable antivirus temporarily

• Some antivirus (McAfee, Norton, Windows Defender) flags lservrc as a “riskware”.
• Restore from quarantine if found.

Phase 3: ETABS 2021 Specific Service Check

ETABS 2021 typically uses the newer licensing structure.

On the Server Computer:

1. Press Windows Key + R, type services.msc, and hit Enter.
2. Scroll down and look for "Sentinel RMS License Manager" (or sometimes "CSI License Manager").
3. Check the Status. It must say "Running".
4. If it is stopped, right-click and select Start.
5. If it fails to start, the installation might be corrupt. Reinstall the CSI License Manager software.

Phase 2: Verify the License Manager Service (Network/Standalone)

The license manager service (Sentinel RMS License Manager) is the heart of the operation. If it's stopped, Error 18 appears instantly.

Steps:

1. Press Win + R, type services.msc, and press Enter.
2. Scroll down to find "Sentinel RMS License Manager" or "Sentinel LDK License Manager" .
3. Check the Status column. It should say Running.
4. If it is stopped, right-click → Start.
5. Set startup type to Automatic: Right-click → Properties → Startup type: Automatic → Apply.

In ETABS 2021 specifically: If the service starts but then stops immediately, proceed to Phase 3 (port conflict).