License.lic - Matlab

Ensure the SERVER and VENDOR lines come first.

2. License Manager Error -15 (Cannot connect to license server)

The license.lic file is an ASCII text file used by the license manager to verify that the software is authorized to run. It is distinct from license.dat (often used on servers) and .lic files used for specific, temporary activations. Key Aspects of license.lic : license.lic matlab

Always return to the MathWorks License Center ( https://mathworks.com/licensecenter ), make changes (e.g., add a toolbox, transfer to a new server), and

Have you encountered a specific License Manager Error? Drop the error number in the comments below! Ensure the SERVER and VENDOR lines come first

The license.lic file acts as the digital gatekeeper for your MathWorks software. It uses a specific syntax that your local MATLAB installation or a Network License Manager interprets.

"Cannot connect to license server system." Cause: MATLAB cannot find the server or the port is blocked. Solution: It is distinct from license

This happens when you upgrade your MATLAB software (e.g., from R2024b to R2026a) but continue using an old license.lic file.

"The host ID in the license file does not match the system." Cause: For standalone/designated computer licenses, the license is locked to your computer's MAC address or CPU serial number. Solution: