Finally, I found the problem, and perhaps it can be useful to other users.
I reinstalled Debian libindi, gsc, WebManager.
When I do start the server with the WebManager, I get the problem of "Got no star", but if on the raspberry, I start the server without the web manager, but directly on the terminal, everything works fine.
So I guess the problem is in setting of the web manager, who does not allow communication with the gsc.