Which ports to open when nodes are protected by a firewall.
If you have a firewall running on the nodes in your Cassandra cluster, you must open up the
following ports to allow communication between the nodes, including certain Cassandra ports.
If this isn’t done, when you start Cassandra on a node, the node acts as a standalone
database server rather than joining the database cluster.
Table 1. Public ports
| 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). |
