xmanager访问centos 6.4的问题

seacnboy

使用xmanager5访问centos 6.4，centos 6.4的177端口已打开，本地防火墙已关闭。
[root@ebs-38100 ~]# netstat -anp | grep 177
udp        0      0 0.0.0.0:177                 0.0.0.0:*                               27729/gdm-binary   

从xmanager界面可以看出已经解析出centos 6.4的主机名，但是访问仍然失败，xmanager日志为：
Xdmcp Connection Address 0: 192.168.2.103
Xdmcp Connection Address 1: fe80::9524:77b6:bfe1:b1ae
Xdmcp Connection Address 2: fe80::1dbc:18ae:b8b7:5b75
Xdmcp Connection Address 3: 192.168.153.1
Xdmcp Connection Address 4: fe80::c941:ed38:4f64:f23f
Xdmcp Connection Address 5: 192.168.109.1
Xdmcp Connection Address 6: fe80::b5a7:f427:f9f9:b456
Xdmcp Connection Address 7: 172.17.222.1
Xdmcp: sent a REQUEST message.
Xdmcp: received an ACCEPT message.
Xdmcp: sent a MANAGE message.
xmgrRRSetConfig: 1920 x 880
Xdmcp: Timed out, state 8. Retransmissions: 0
Xdmcp: sent a MANAGE message.
Xdmcp: Timed out, state 8. Retransmissions: 1
Xdmcp: sent a MANAGE message.
Xdmcp: Timed out, state 8. Retransmissions: 2
Xdmcp: sent a MANAGE message.
Xdmcp: Timed out, state 8. Retransmissions: 3
XDM go to sleep: too many retransmissions

求大神指导，谢谢！

lyhabc

177 XSHELL是什么应用？sshd？