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Before You Install
Note: A basic understanding of Linux is assumed throughout the installation, upgrade, and removal processes.
Understand Tenable.sc Licenses
Confirm your licenses are valid for your Tenable.sc deployment. Tenable.sc does not support an unlicensed demo mode – a license key is required.
For more information, see Licenses.
Disable Default Web Servers
Tenable.sc provides its own Apache web server listening on port 443. If the installation target already has another web server or other service listening on port 443, you must disable that service on that port or configure Tenable.sc to use a different port after installation.
Identify which services, if any, are listening on port 443 by running the following command:
# ss -pan | grep ':443 '
Modify Security Settings
The default Red Hat firewall settings cause issues with Tenable.sc’s web services. To alleviate this, set SELinux to Disabled in Enforcing mode or to Enabled in Permissive mode.
To disable SELinux in Enforcing mode:
- Navigate to: /etc/selinux.
- Edit the
- Change the SELINUX line from
- Save the file.
- Reboot the system.
- Confirm the following incoming services are permitted by the firewall rules:
- SSH (port 22 by default)
- HTTPS (port 443 by default)
RHEL 6, RHEL 7/CentOS 6, CentOS 7 - the local firewall may be disabled upon install and the user should re-enable it with the appropriate access information
- Confirm the following ports are open for Tenable.sc to communicate with other Tenable products:
- NNM (port 8835 by default)
- Nessus (port 8834 by default)
- Log Correlation Engine (port 1243 by default)
Note: Please consult local security and best practices within your environment for the proper usage and configuration of SELinux. Tenable.sc is known to work with SELinux in Enforcing mode with some customization of the SELinux rules. However, permitted rules vary from organization to organization.
Perform Log File Rotation
The installation does not include a log rotate utility; however, the native Linux
logrotate tool is supported post-installation. In most Red Hat environments,
logrotate is installed by default. The following logs are rotated if the
logrotate utility is installed:
- All files in
/opt/sc/support/logs matching *log
During an install/upgrade, the installer drops a file named SecurityCenter into
/etc/logrotate.d/ that contains log rotate rules for the files mentioned above.
Log files are rotated on a monthly basis. This file is owned by
Obtain the Installation Package
The installer comes in a number of versions based on OS level and architecture:
- or -
Depending on the OS of the host, you may also need to move the installer to it using your preferred file transfer tool.