Port 6556
checkmk-agent · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | checkmk-agent |
| Registered | 2020-07-14 |
| Modified | 2024-08-06 |
Frequently asked questions
What is port 6556 used for?
Port 6556 is registered with the IANA for checkmk-agent (TCP/UDP). Description: Checkmk Monitoring Agent; Reserved.
Is port 6556 a well-known port?
No. Port 6556 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 6556 is open?
Locally on Linux with ss -tulpn | grep ':6556\b', on Windows with netstat -ano | findstr :6556. To test a remote host use Test-NetConnection <host> -Port 6556 in PowerShell or nc -zv <host> 6556 on Linux/macOS.
How do I open port 6556 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 6556/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=6556/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 6556" -Direction Inbound -Protocol TCP -LocalPort 6556 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | checkmk-agent | Checkmk Monitoring Agent |
| UDP | – | Reserved |