GDM is the default #202205182153 for GNOME desktop environment. Its main configuration file is /etc/X11/gdm/gdm.conf (older) or /etc/gdm/custom.conf (newer).
To enable remote access to the #202205182136, set the option enable to yes in the section [xdmcp] in the configuration file. If it appears to have errors upon connecting to the client, change DisallowTCP from true to false for older version or add in the line DisallowTCP=false under the section [security].