CMK-Agent-Ctl.exe/TLS error

Troubleshooting
1

2.1.0p13.cee
Ubuntu 16.04.7 LTS

Attempting to register windows host with TLS upon performing corresponding command

cmk-agent-ctl.exe register --hostname xxx --server checkmk:8000 --site monitoring --user automation --password xxx

Receive the following error. If anyone has any ideas to resolving please let me know. :slight_smile:

[2022-11-15 12:06:06.273021 -05:00] ERROR [cmk_agent_ctl] src\main.rs:29: Error
pairing with checkmk.mnp.ca:8000/monitoring

Caused by:
0: error sending request for url (https://checkmk8000/monitoring/age
nt-receiver/pairing): error trying to connect: The message received was unexpect
ed or badly formatted. (os error -2146893018)
1: error trying to connect: The message received was unexpected or badly for
matted. (os error -2146893018)
2: The message received was unexpected or badly formatted. (os error -214689
3018)

Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)

2

Forgot to mention that this is a Windows 2012 R2 host so there might be support/incompatibility with the version of TLS between Windows 2012 R2 server and Checkmk 2.1. Any feedback would be appreciated.

3

Hi,

in the register-command use --server checkmk without the port, maybe there is a formatting problem with that. Port 8000 will be used as default anyway.

Cheers Jeronimo

5

Not sure why you commented your own post…
We use system center to register and deploying the agent with a custom PS script. (That does some other tings as well)

6

That seemed to have worked great thanks “jwiederh”. Are you aware of any automation scripts/commands methods with registering agent/TLS for over 800+ hosts?

7

Corrected sorry newbie. Good ol Microsoft SC i think ill look into other methods for windows such as PSDEPLOY and Ansible for linux

8

Yea that depends on your install base I guess, our is to large to run Ansible as it would take way to long…

9

Anders, out of curiosity, what command/syntax did you run to use for automating agent registration. I notice utilizing %computername% doesnt work periodically as some of my implemented hosts in Checkmk are lower/upper case. Not my doing. Do you know of a syntax to use? Something has to work as surely i dont need to run registration manually on 800+ hosts. I have been looking everywhere for some feedback. I will also need a syntax for Linux as well.

“C:\Program Files (x86)\checkmk\service\check_mk_agent.exe” ^
updater register -s checkmk.mnp.ca -i monitoring -H %computername% -p https -U userx -P userx -v

10

We don’t use computer name at all as we have FQDN in Checkmk (We have multiple domains as well)
So we rely on the TCP/IP settings that I get in PS, like below. Hosts are added to Checkmk using automation and from our CMDB where they are always in lowercase so not a big problem, at least for us.

$Hostname = (gpv HKLM:\SYSTEM\CurrentControlSet\services\Tcpip\Parameters HostName, Domain) -join '.'

11

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