Hello,
I understand that the port 38181 is blocked on the firewall. Before moving forward, I would like to ask couple questions.
1. Are you using centos 5/6 or 7? Since from Centos 7 onwards, by default iptables doesn't come with default installation. If you are using Centos 5/6, execute the below command to get to know whether the port is blocked or not.
iptable -nL|grep 38181
2. Identify the chain name where the port is being blocked and remove the rule using the line number
iptables -L --line-numbers
iptables -D INPUT <line-number>
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