Comunication failed errno 113 even when the conection is fine on host

[JArdissone]

CMK version: Checkmk Raw Edition 2.3.0p23
OS version:Ubuntu 22.04.5 LTSCMK version:
Error message: comunication failed errno 113
I notice that the cmk agent wasn’t pulling new data, I re-installed the agent, register the host check the agent status and everything looks fine but I keep having the error when I check the connection on host setup. Doing a traceroute from the cmk server to the host server give me an error.

[MarioC.Datek (Mario Casero)]

HI!

if the connection is via normal agent, not special agent, it performs a connection test to port 6556, which is the port through which the call to the agent is made.

If it is a special agent, try adding in the file /etc/hosts the following: 192.168.4.4.4 server17
In some cases as in proxmox when the request is made, it is made through the hostname and not through the IP.

[JArdissone]

It’s via normal agent, I don’t know about special agents.
what’s the benefits of using special agent or when an how I use them?, thanks for the response

[MarioC.Datek (Mario Casero)]

the special agents are the ones used by VMware proxmox Azure etc… these agents are totally different from the normal agents since they extract the information through API or WEB and not like the “normal” agents that extract the information through the execution of scripts in the machines.
it could be said that neither has an advantage over the other as they are used for different systems.