When configuring firewall rules for Mule apps in a VPC, which statement is accurate about ports?

• A. Open ports 80, 8081, 8082 only
• B. Open ports 443 and 80 only
• C. Open ports 21, 25
• D. Open ports in addition to 80, 8081, 8082 as required

Answer: (D)

In configuring firewall rules for Mule apps in a VPC, you must align allowed ports with what the deployment actually uses. The Mule runtime and its components often rely on standard ports like 80 for HTTP and the internal ports such as 8081 and 8082, but the exact set can vary based on your app, connectors, and external services. Therefore, you should open 80, 8081, 8082 as a baseline and then open any additional ports required by your specific configuration, endpoints, or integrations. This approach follows the principle of granting only the necessary access, avoiding unnecessary exposure.

The other options restrict or misstate the needs: sticking to a fixed small set may block required traffic, and including unrelated ports (like FTP or SMTP ports) isn’t relevant for typical Mule deployments. The correct stance is to open ports beyond the standard ones only as your app requires.