编辑如下文件:
[root@boss gdm]# cat /etc/gdm/custom.conf
# GDM configuration storage
[daemon]
[security]
AllowRemoteRoot=yes
[xdmcp]
Enable=1
Port=177
[greeter]
[chooser]
[debug]
启动gdm
[root@boss ~]# gdm &
[1] 3079
[root@boss ~]# netstat -an | grep 177
udp 0 0 0.0.0.0:177 0.0.0.0:*
unix 3 [ ] STREAM CONNECTED 36177 /var/run/dbus/system_bus_socket
unix 3 [ ] STREAM CONNECTED 17763 /var/run/dbus/system_bus_socket
unix 3 [ ] STREAM CONNECTED 17762
unix 2 [ ] DGRAM 17728
[root@boss ~]# lsof -i udp:177
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
gdm-binar 3079 root 7u IPv4 27446 0t0 UDP *:xdmcp
接下来用x manager连接即可。如果不能正常连接,请检查防火墙是否配置了策略或者干脆关闭防火墙。