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Part 1. Server Side (Environment: RHEL 6.3)Open the XDMCP configuration file and specify port 177. # vi/etc/gdm/custom.conf # GDM Configuration Storage [daemon] [security] [XDMCP] enable=1 port=177 [greeter] [Chooser] [D Ebug] Configures the iptables of the Redhat firewall. # vi/etc/sysconfig/iptables # Firewall configuration written by System-config-firewall # Manual customization of this FIL E is not recommended. *filter:input ACCEPT [0:0]: FORWARD ACCEPT [0:0]: OUTPUT ACCEPT [0:0]-A input-m State--state established,related-j AC CEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A input-p UDP--dport 177-j ACCEPT #这里若-I port specified ports can cause a post issue-a input-j REJECT--reject-with icmp-host-prohibited-a F Orward-j REJECT--reject-with icmp-host-prohibited COMMIT reboot iptables # service iptables restart Open XDm # XDM View XDm operation # p S-ef | grep XDM View 177 Port Application # lsof-i:177 View 177 Ports # netstat-an| GREP 177 server How to reboot # reboot Finally, check that the native firewall is off
Part 2. ClientXBROWSER-WIZZARD-XDMCP Query-Host address-Port 177
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