8139
Puppet Agent
High RiskTCP — System & Infrastructure
Port Overview
Port Number
8139
Service Name
Puppet Agent
Transport Protocol
TCP
Category
System & Infrastructure
Security Risk
High
Port Range
Registered (1024-49151)
What is Port 8139?
Port 8139 is used by the legacy Puppet configuration management agent to receive catalog information from the Puppet master server. Puppet masters push configuration catalogs to agents running on managed nodes via this port. Modern Puppet versions use port 8140 for HTTPS communication, but 8139 appears in older deployments.
TCP
System & Infrastructure
Security Considerations
Port 8139 (Puppet Agent) 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.