How to Fix MATLAB License Manager Error -8 (HostID mismatch)?

support - 2026-07-23T21:24:35+05:30

Question: How to Fix MATLAB License Manager Error -8 (HostID mismatch)?

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?

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Expert Answer

John Williams answered . 2026-07-23

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:

1. Open Command Prompt (Windows) or Terminal (macOS/Linux) and run ipconfig /all or getmac.
2. Find your active Ethernet or Wi-Fi Physical Address (MAC ID).
3. Log into MathWorks License Center, select your license, and click Edit License File / Reactivate with the new HostID.
4. Replace the old license.dat in matlabroot/licenses/ with the updated license file and restart MATLAB.

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