Why do I receive a connection error when launching MATLAB with Login Named User enabled?

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MathWorks Support Team
MathWorks Support Team on 4 Mar 2021
Edited: MathWorks Support Team on 23 Jan 2026 at 16:18
Why do I receive the following error when launching MATLAB with Login Named User (LNU) enabled:
Connection Error

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Accepted Answer

MathWorks Support Team
MathWorks Support Team on 22 Jan 2026 at 0:00
Edited: MathWorks Support Team on 23 Jan 2026 at 16:18
A connection error when launching MATLAB using Login Named User indicates that MATLAB is being prevented from reaching MathWorks' licensing servers. Please visit the link below for connection error issues.
Which ports and addresses do MathWorks products and MathWorks Online Services use?
https://www.mathworks.com/matlabcentral/answers/97265

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