Apache ZooKeeper
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TCP — Database
Port Overview
What is Port 2181?
Port 2181 is the default client port for Apache ZooKeeper, a distributed coordination service. Applications like Apache Kafka, Hadoop, and HBase use ZooKeeper for distributed synchronization, configuration management, and leader election. Exposing this port without authentication can allow unauthorized access to distributed system configurations.
Security Considerations
Port 2181 (Apache ZooKeeper) is classified as high risk. This port is a common target for automated scanning and brute-force attacks. If you must expose it, restrict access to known IP addresses.
Recommendation: Use firewall rules to whitelist trusted IPs. Enable rate limiting and intrusion detection.