2.1.0p9 - TLS is not activated

Troubleshooting
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1

CMK version: 2.1.0p9
OS version: Ubuntu 20.04.5 LTS

**Error message:**ERROR [cmk_agent_ctl] Failed to discover agent receiver port from Checkmk REST API, both with http and https.

Error with http:
Failed to discover agent receiver port from http://10.255.254.250/monitoring/check_mk/api/1.0/domain-types/internal/actions/discover-receiver/invoke
error sending request for url (http://10.255.254.250/monitoring/check_mk/api/1.0/domain-types/internal/actions/discover-receiver/invoke): error trying to connect: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1919: (unable to get local issuer certificate)
error trying to connect: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1919: (unable to get local issuer certificate)
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1919: (unable to get local issuer certificate)
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1919:

Error with https:
Failed to discover agent receiver port from https://10.255.254.250/monitoring/check_mk/api/1.0/domain-types/internal/actions/discover-receiver/invoke
error sending request for url (https://10.255.254.250/monitoring/check_mk/api/1.0/domain-types/internal/actions/discover-receiver/invoke): error trying to connect: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1919: (unable to get local issuer certificate)
error trying to connect: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1919: (unable to get local issuer certificate)
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1919: (unable to get local issuer certificate)
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1919:

Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins) Check_MK Agent Version: 2.1.0p9, OS: linux, TLS is not activated on monitored host (see details)(!), Last update: Oct 14 2022 14:35:45, Agent plugins: 3, Local checks: 0

Reinstalled already, did not find out what the issue is… I think I am overlooking something…

2

You might want to add the port (usually 8000) to the commnd. I am deep linking on the section in the docs:

3

Hi,

Going to check if this helps, many thanks in advance!