zabbix appliance firewall problem

[chewy]

I'm trying to get up and running with the zabbix appliance 3.0.1 iso. I installed the mysql server version and i've been playing around but when I try to use active checks on a test windows machine, I cannot connect to port 10051 on the appliance.

When I run netstat I see this line:
tcp 0 0 *:zabbix-trapper *:* LISTEN

so I assume the port is open.

In the agent log on the windows machine I see:
active check configuration update from [x.x.x.x:10051] started to fail (cannot connect to [[x.x.x.x]:10051]: A connection timeout occurred.

Per the docs, I thought port 10051 was open on the appliance. I ran sudo service iptables-persistent flush and I think that stops the firewall because I can see data but i'd prefer to have the firewall on.

Anyone know what to do to fix the problem or adjust the firewall if there's a problem?

[obasigeorge]

Edit the iptables file

there is a missing line in /etc/iptables/rules.v4

Add the following line in the ZBX section
-A INPUT -s 0/0 -p tcp --dport 10051 -j ZBX

restart the service
service iptables restart