我尝试远程连接Postgresql（v9.6），但似乎无法连接。我的Postgres位于CentOS 7服务器上。从该服务器上，我为各种网站提供服务（端口80xx），我还成功地使用了端口5050上的服务。似乎只有端口5432有问题。例如：

$ lsb_release -a
LSB Version:    :core-4.1-amd64:core-4.1-noarch
Distributor ID: CentOS
Description:    CentOS Linux release 7.4.1708 (Core)
Release:        7.4.1708
Codename:       Core

$ sudo firewall-cmd --zone=public --add-port=5432/tcp --permanent
Warning: ALREADY_ENABLED: 5432:tcp
success

$ sudo firewall-cmd --reload
success

$ sudo iptables -S | grep "5432"
-A IN_public_allow -p tcp -m tcp --dport 5432 -m conntrack --ctstate NEW -j ACCEPT

$ netstat -nlp | grep 5432
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN      -
tcp6       0      0 ::1:5432                :::*                    LISTEN      -
unix  2      [ ACC ]     STREAM     LISTENING     516044892 -                    /var/run/postgresql/.s.PGSQL.5432
unix  2      [ ACC ]     STREAM     LISTENING     516044894 -                    /tmp/.s.PGSQL.5432

这就是我的工作：

> psql -h xx.xx.xx.xx -p 5432 -U postgres
psql: could not connect to server: Connection refused
        Is the server running on host "xx.xx.xx.xx" and accepting
        TCP/IP connections on port 5432?

这是我的pg_hba.conf

host    all             all             127.0.0.1/32            ident
host    all             all             ::1/128                 ident
host    all             all             172.17.0.0/24           trust
host    all             all             0.0.0.0/0               md5

并且我还修改了postgresql.conf以侦听端口5432上的'*'，并重新启动了服务器。
我错过了什么？
PS：我可以在本地连接，因为我的一些Web应用程序正在使用此服务器存储数据。
编辑：这样可以吗？

$ netstat -tulpn | awk 'NR==2 || /:5432/'
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN      -
tcp6       0      0 ::1:5432                :::*                    LISTEN      -