Question
When starting MATLAB, I get License Manager Error -8: Encryption code in license file does not match HostID. What causes this error and how do I fix it?
Expert Answer
John Williams
PhD Expert
Answered Aug 30, 2026
License Manager Error -8 occurs when the MAC address (HostID) or Volume Serial Number listed in your license.dat or lic_standalone.dat file does not match the active physical network adapter on your computer.
Step-by-Step Fix:
- Open Command Prompt (Windows) or Terminal (macOS/Linux) and run
ipconfig /allorgetmac. - Find your active Ethernet or Wi-Fi Physical Address (MAC ID).
- Log into MathWorks License Center, select your license, and click Edit License File / Reactivate with the new HostID.
- Replace the old
license.datinmatlabroot/licenses/with the updated license file and restart MATLAB.
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