Oracle Solaris 11.1, 11.2, 11.3 XDMCP Configuration

Display manager configuration: Configure GDM

Open the following GDM configuration file and set the Enable entry to true in the [xdmcp] section:
# vi /etc/gdm/custom.conf

[xdmcp]

Enable=true (Mandatory. The default value is false)
DisplaysPerHost=100 (Optional. The default value is 2)
MaxSessions=100 (Optional. The default value is 2)

Reboot or restart gdm daemon

# svcadm restart gdm