Which port should be opened to ensure the NDB server, NDB agent, and NDB database agent can communicate with the registered cluster via REST API calls?

The Nutanix Database Service (NDB) server communicates with the registered Nutanix cluster's Prism Element for all management and orchestration tasks. This communication, which includes REST API calls, occurs over the standard Prism Element HTTPS port, which is 9440. This port must be open from the NDB server to all Controller VMs (CVMs) in the cluster to ensure proper functionality, including provisioning, snapshots, and monitoring.

A. 2009: This port is used for iSCSI traffic redirection within the Nutanix cluster, not for management API calls from NDB.
B. 3205: This port is used by the iSCSI redirector service on Nutanix CVMs for database server VM connections, not for API communication.
C. 3260: This is the standard iSCSI target port used by database server VMs to connect to Nutanix Volumes, not for the NDB server's API calls.

1. Nutanix, "Ports and Protocols," Nutanix Portal, updated 2024-04-26. In the "Nutanix Database Service (NDB)" section, the table specifies that for "NDB Server to Prism Element (PE)," the destination port is TCP 9440 for "API calls."

2. Nutanix, "Setting Up the NDB Server VM," Nutanix Database Service Administration Guide v2.5, 2023-03-23. Section: "Firewall Port Requirements," states, "Ensure that the required ports are open for NDB to communicate with other components... NDB server to Nutanix cluster (Prism Element)... TCP 9440."