pgadmin3 连接 虚拟机上postgresql9.01 提示Server doesn't listen

系统centos5.5

提示信息如下：
Server doesn't listen
The server doesn't accept connections: the connection library reports
could not connect to server: Connection timed out (0x0000274C/10060) Is the server running on host "192.168.199.128" and accepting TCP/IP connections on port 5432?

虚拟机内部，连接postgresql正常，
通过本机连接虚拟机ssh连接也是正常的
唯独通过pg_admin3连接，提示如上信息提示服务器未监听错误

修改配置文件postgresql.conf

listen_addresses = '*'          # what IP address(es) to listen on;
                                        # comma-separated list of addresses;
                                        # defaults to 'localhost', '*' = all
                                        # (change requires restart)
port = 5432                             # (change requires restart)
max_connections = 100                   # (change requires restart)
password_encryption = on

已经找到原因是，防火墙问题，关闭防火墙后能够正常访问

iptables 中开启对tcp 端口是5432 访问，
重启防火墙，依然无法访问，很奇怪问题！