Running MacOS 10.12.3 On each invocation of Matlab R2017a, MacOS asks "Allow incoming connections, Allow / Deny". The answer doesn't get remembered for the next time I open Matlab. I have Matlab 2016a and 2017a installed side-by-side. The issue doesn't occur on MATLAB_R2016a, only on MATLAB_R2017a. I have worked around this by adding manually the file "/Applications/MATLAB_R2017a.app/Contents/MacOS/MATLAB" to the Firewall allowed list. I had to do this manually, as it wouldn't remember the setting from the prompt.