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Message Service fatally disconnected

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YUKI GOYA
YUKI GOYA on 1 Apr 2020
Commented: Amin Salehi on 6 Apr 2021
hi,
I am recently seeing the following error popup while running my code in MATLAB R2019b.
JavaScript Alert - https://localhost:31515
Message Service fatally disconnected.
it happens randomly and i would like to know what could be the cause of it and how to fix it.
I never had this issue while running R2014b and it suddenly started when I switched to R2019b. My computer is running under Windows 10 pro (build 1909).
thank you in advance.
yuki
  5 Comments
Amin Salehi
Amin Salehi on 6 Apr 2021
Same here, following, MacOS Big Sir

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Answers (1)

Patrik Forssén
Patrik Forssén on 12 Nov 2020
Got this error also and (local) help-pages stoped working. Not even reinstallation of MATLAB (R2020a, Win 10) helped to resolve the issue.
Seems to be a problem with corrupt preferences. After deleting the preferences directory, and reinstallation, help worked again with no error messages (so far). Type
prefdir
in the MATLAB command window, exit MATLAB and delete the preferences directory (WARNING! all your custom settings will be lost). I do not think reinstallation is actually necessary after that, just re-starting MATLAB should be sufficent.
After you have set your custom preferences again you might want to exit MATLAB and save a backup copy of the preferences directory so you can replace it if you experience similar problems again.

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