X11 not displaying when run in ssh session

Hi,

I am experiencing some troubles with X11.

I am using macOS (Big Sur 11.4), everything was working well until I did an update of XQuartz (2.8.1). From that moment, when I connect to an ssh session and I try do some graphical display from the Apple terminal, the command just remains stuck after an empty line is printed.

In addition, I just realized that if I give the simple command "xclock" in the Apple terminal, it remains stuck as well. Regarding to this, I found an old post in this forum that suggested to set the DISPLAY variable as :0.0 . I tried, and I could run the xclock and related commands from the Apple terminal.

However, I still cannot do it when I work in ssh and I couldn't find instructions about how to do this.

There is an additional particular that is driving me crazy: this problem appeared to be fixed few days ago, when I connected to a new network and the graphic was successfully displayed. The day after, the problem was there again (same network).

Any suggestion is very welcome.

Thanks in advance,

Valentina