Additional Configuration for SDCs and CDO Connectors Installed on a VM You Created

If you installed your CDO Connector on your own CentOS 7 virtual machine, perform one of the following additional configuration procedures to allow events to reach the SEC:

Disable the firewalld service on the CentOS 7 VM: This matches the configuration of the Cisco-provided SDC VM.
Allow the firewalld service to run and add firewall rules to allow event traffic to reach the SEC: This is a more granular approach to allowing inbound event traffic.

Before you begin:

This is the second of three steps you need to complete in order to install and configure your SEC. If you have not already, complete Install a CDO Connector to Support an SEC Using Your VM Image before making these configuration changes.

After you complete one of the additional configuration changes described here, complete Install the Secure Event Connector

Disable the firewalld service on the CentOS 7 VM

Log into the CLI of the SDC VM as the "CDO" user.
Stop the firewalld service, and then ensure that it will remain disabled upon subsequent reboots of the VM. If you are prompted, enter the password for the CDO user:
```
[CDO@SDC-VM ~]$ sudo systemctl stop firewalld
CDO@SDC-VM ~]$ sudo systemctl disable firewalld
```
Restart the Docker service to re-insert Docker-specific entries into the local firewall:

[CDO@SDC-VM ~]$ sudo systemctl restart docker
Continue to Install the Secure Event Connector.

Allow the firewalld service to run and add firewall rules to allow event traffic to reach the SEC

Log into the CLI of the SDC VM as the "CDO" user.
Add local firewall rules to allow incoming traffic to the SEC from the TCP, UDP, or NSEL ports you configured. See Finding Your Device's TCP, UDP, and NSEL Port Used for Cisco Security Analytics and Logging for the ports used by your SEC. If prompted, enter the password for the CDO user. Here is an example of the commands. You may need to specify different port values.
```
[CDO@SDC-VM ~]$ sudo firewall-cmd --zone=public --permanent --add-port=10125/tcp 
CDO@SDC-VM ~]$ sudo firewall-cmd --zone=public --permanent --add-port=10025/udp
[CDO@SDC-VM ~]$ sudo firewall-cmd --zone=public --permanent --add-port=10425/udp
```
Restart the firewalld service to make the new local firewall rules both active and persistent:

[CDO@SDC-VM ~]$ sudo systemctl restart firewalld
Continue to Install the Secure Event Connector.