Access remote Postgres server with pgAdmin

I've got pgAdmin running on my XP machine. There's a Centos machine running a Postgres server on the network. The Postgres server pg_hba.conf file has the following lines

TYPE      DATABASE    USER      CIDR-ADDRESS       METHOD
host      all         all       10.0.0.68/32       trust
local     mydb        myuser                       password
local     all         postgres                     ident
host      mydb        myuser    10.0.0.68/32       password
host      all         postgres  10.0.0.68/32       trust

My postgresql.conf file has the following line:

listen_address = 'localhost, 10.0.20.10'

nmap -sS 10.0.20.10 shows:

PORT      STATE     SERVICE
5432/tcp  open      postgresql

I can ssh into a bash shell on the server, but I can't connect 开发者_如何学运维with pgAdmin. I get the following:

could not connect to server: No route to host(0x00002751/10065) Is the server running on host "10.0.20.10" and accepting TCP/IP connections on port 5432?

I've no idea what the problem is.

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@Aidan found the solution himself:

It was a firewall issue.

service iptables stop

enabled the connection. I'll just write a rule to allow the connection.

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Suppose server's IP address is 10.0.20.10 then you could just add these iptable rules as @Dark Star1 proposed in comments:

iptables -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d 10.0.20.10 --dport 5432 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp -s 10.0.20.10 --sport 5432 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT