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How do I block external access to the Controller Database?

This topic provides a firewall-based method to block external access to the Controller MySQL Database by dropping all traffic trying to connect to port 3388.


Environment and components

Linux such as RHEL, Centos, systems using iptables if your system uses iptables, you can do this. If not, contact your sysadmin for an alternative.



As root, these commands:


iptables -A INPUT -s -p tcp --dport 3388 -j ACCEPT 
iptables -A INPUT -p tcp --dport 3388 -j DROP 
service iptables save


These commands do the following:

1. Create a firewall rule allowing port 3388 to be accessed from localhost (

2. Create a firewall rule blocking all access to port 3388.

3. Save the firewall rules so they are automatically applied at boot time.

Version history
Revision #:
3 of 3
Last update:
‎11-26-2018 04:08 PM
Updated by:

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