Is port 6556 (Check MK Agent) dangerous?

Port 6556 is classified as medium risk. It is commonly exposed but consider using encrypted alternatives where available and monitor activity.

Should port 6556 be open on my firewall?

Port 6556 can be open but should be monitored closely. Keep the service updated and prefer encrypted alternatives where available.

What transport protocol does port 6556 use?

Port 6556 (Check MK Agent) uses the TCP transport protocol and falls under the System & Infrastructure category.

:6556 (TCP)

Check MK Agent

Medium Risk

TCP — 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.

Related Ports — System & Infrastructure

0 Reserved 1 TCPMUX 2 Management Utility 3 CompressNET 4 Unassigned 5 RJE 6 Unassigned 7 Echo

Related Terms

Bandwidth Latency Packet Loss Ping Throughput ASN