The license runs as a background service. If the service is stopped or set to "Manual," Error 18 will occur.

Alternatively, try creating a file named LSHOST (with no file extension) containing the server's IP address. Advanced Troubleshooting

: Ensure your computer's date and time are synchronized with an internet time server.

Launch SAP2000. If the error is gone, you are finished. If not, continue.

: For network-based setups, create a file named LMHOST.INI in the installation folder (e.g., C:\Program Files\Computers and Structures\SAP2000 ). Inside, type the IP address or server name of the license server to help the client machine locate the key faster.