CentOS XDMCP configuration
1. Server settings
1).Edit /etc/gdm/custom.conf，in order to enable xdmcp:
[xdmcp]
Enable=1
2). If you need root users can log in XDMCP Using remote desktop , add
[security]
AllowRemoteRoot=true
3). Open firewall settings:
Open xdmcp port number: UDP 177,and open TCP ports from 6000 to 6010
Also,you can directly edit /etc/sysconfig/iptables :
-A RH-Firewall-1-INPUT -m state –state NEW -m udp -p udp –dport 177 [...]
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