6556
Check MK Agent
Medium RiskTCP — System & Infrastructure
Port Overview
Port Number
6556
Service Name
Check MK Agent
Transport Protocol
TCP
Category
System & Infrastructure
Security Risk
Medium
Port Range
Registered (1024-49151)
What is Port 6556?
Port 6556 is used by the Check MK (Checkmk) monitoring agent installed on servers being monitored. The Checkmk monitoring system connects to this port to collect metrics and health data from monitored hosts. This port should be restricted to access only from the monitoring server IP address.
TCP
System & Infrastructure
Security Considerations
Port 6556 (Check MK Agent) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.
Recommendation: Keep the service updated. Monitor logs for unusual activity.