Which ports to open when nodes are protected by a firewall.
The following ports must be open to allow bi-directional communication between nodes,
including certain DataStax Distribution of Apache Cassandra™ (DDAC) ports.
Configure the firewall running on nodes in your cluster accordingly. Without open ports as
shown, nodes will act as a standalone database server and will not join the Cassandra
cluster.
Table 1. Public port
| Port number |
Description |
| 22 |
SSH port |
Table 2. Cassandra inter-node ports
| Port number |
Description |
| 7000 |
Cassandra inter-node cluster communication. |
| 7001 |
Cassandra SSL inter-node cluster
communication. |
| 7199 |
Cassandra JMX monitoring port. |
Table 3. Cassandra client ports
| Port number |
Description |
| 9042 |
Cassandra client port. |
| 9160 |
Cassandra client port (Thrift). |
| 9142 |
Default for native_transport_port_ssl,
useful when both encrypted and unencrypted connections are required |
