Why is MATLAB trying to connect to X11 server even when started with -nodisplay ?

I just upgraded from 2016b to 2019a and started seeing this warning when I launch MATLAB:

[~]$ matlab -nodisplay
PuTTY X11 proxy: unable to connect to forwarded X server: Network error: Connection refused
PuTTY X11 proxy: unable to connect to forwarded X server: Network error: Connection refused

In fact, even this:

[~]$ matlab -nojvm -nodisplay -nosplash -nodesktop
PuTTY X11 proxy: unable to connect to forwarded X server: Network error: Connection refused
PuTTY X11 proxy: unable to connect to forwarded X server: Network error: Connection refused

To be clear everything seems to work as expected after startup. I just don't like seeing the warning.

Any ideas appreciated,

--naor

Answer 1

[Santhosh A V]

Hi Naor,

Can you let me know whether the X11 forwarding is enabled in your Putty Configuration.

Thanks

Santhosh

[Naor Movshovitz]

Yes, X11 forwarding is in fact enabled, even when I don't have an X11 server running.

[Santhosh A V]

Hi Naor,

X11 forwarding is not supported with MATLAB.

Thanks

Santhosh