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 bi-directional communication among 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 |
CQL native clients port. |
| 9160 |
Cassandra client port (Thrift). |
