使用clousera-manager安装CDH 报错～求高手帮忙给解答下

使用cloudera-manager进行CDH4的安装，
主机安装过程报错::
安装失败。 无法接收 Agent 发出的检测信号。

请确保主机的名称已正确配置。
请确保端口 7182 可在 Cloudera Manager Server 上访问（检查防火墙规则）。
请确保正在添加的主机上的端口 9000 和 9001 空闲。
检查正在添加的主机上 /var/log/cloudera-scm-agent/ 中的代理日志（某些日志可在安装详细信息中找到）。
详细log：

无法接收 Agent 发出的检测信号。 (当前步骤)


正在启动 Cloudera Manager Agent...
BEGIN /sbin/service cloudera-scm-agent status | grep running
server_host=192.168.123.10
END (1)
BEGIN /sbin/service cloudera-scm-agent start
正在启动 cloudera-scm-agent：[60G[[0;32m确定[0;39m]
END (0)
agent logs:
BEGIN tail -n 50 /var/log/cloudera-scm-agent//cloudera-scm-agent.out | sed 's/^/>>/'
END (0)
BEGIN tail -n 50 /var/log/cloudera-scm-agent//cloudera-scm-agent.log | sed 's/^/>>/'
>> self.conn.connect()
>> File "/usr/lib64/python2.6/httplib.py", line 720, in connect
>> self.timeout)
>> File "/usr/lib64/python2.6/socket.py", line 567, in create_connection
>> raise error, msg
>>error: [Errno 111] Connection refused
>>[24/Mar/2014 14:55:53 +0000] 7202 MainThread agent ERROR Heartbeating to localhost:7182 failed.
>>Traceback (most recent call last):
>> File "/usr/lib64/cmf/agent/src/cmf/agent.py", line 741, in send_heartbeat
>> self.master_port)
>> File "/usr/lib64/cmf/agent/build/env/lib/python2.6/site-packages/avro-1.6.3-py2.6.egg/avro/ipc.py", line 471, in __init__
>> self.conn.connect()
>> File "/usr/lib64/python2.6/httplib.py", line 720, in connect
>> self.timeout)
>> File "/usr/lib64/python2.6/socket.py", line 567, in create_connection
>> raise error, msg
>>error: [Errno 111] Connection refused
>>[24/Mar/2014 14:56:53 +0000] 7202 MainThread agent ERROR Heartbeating to localhost:7182 failed.
>>Traceback (most recent call last):
>> File "/usr/lib64/cmf/agent/src/cmf/agent.py", line 741, in send_heartbeat



有没有哪位大侠遇到过， 给解答下～～感激不尽～