What action should be taken if Cortex XDR Agents are not communicating with the Management Console?

The appropriate action to take if Cortex XDR Agents are not communicating with the Management Console is to reinstall the root CA certificate. The root Certificate Authority (CA) certificate is crucial for establishing a trusted connection between the agents and the Management Console. If the CA certificate is not properly installed or is corrupted, the secure communication required for the agents to report their status and receive commands may be disrupted, leading to communication failures.

Reinstalling the root CA certificate ensures that the agents can authenticate the Management Console’s identity and establish a secure connection over SSL/TLS, which is necessary for proper functionality. In scenarios where system updates or changes have occurred, this step can remedy issues related to certificate validation and trust that might prevent successful communication.

The other options may not address the underlying problem effectively. While enabling or disabling SSL decryption addresses the ability to inspect traffic for security purposes, it does not directly resolve issues related to certificate trust. Adding a domain to the SSL Decryption Exclusion List is also not relevant in this situation, as the problem lies with the agents’ inability to authenticate through the existing certificate rather than decryption policies.