8042
YARN NodeManager
High RiskTCP — Other
Port Overview
Port Number
8042
Service Name
YARN NodeManager
Transport Protocol
TCP
Category
Other
Security Risk
High
Port Range
Registered (1024-49151)
What is Port 8042?
Port 8042 is the default port for the Apache Hadoop YARN NodeManager web interface. NodeManagers run on each worker node in a Hadoop cluster to manage containers and report resource usage to the ResourceManager. The web UI on this port shows running containers, logs, and node health information.
TCP
Other
Security Considerations
Port 8042 (YARN NodeManager) 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.