License checkout failed. Invalid host. License Manager Error -9

License checkout failed.

Invalid host. License Manager Error -9

[Walter Roberson]

That is a new one to me; it does not match any of the cases I have catalogued in https://www.mathworks.com/matlabcentral/answers/404028-license-problems-cheat-sheet

Answer 1

[Image Analyst]

See the FAQ: https://matlab.fandom.com/wiki/FAQ#After_installation,_MATLAB_crashes_or_gives_an_error_message_when_I_try_to_run_MATLAB.

Do exactly what it says there and you should be working right away.