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…