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One possible solution is to follow the steps in the article below: Checkmk agent systemd service repeatedly failing on CentOS 7
Registration with cmk-agent-ctl is not working
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ERROR [cmk_agent_ctl] Failed to discover agent receiver port from Checkmk REST API, both with http and https.
Problem
Upon You encounter this error when registering the agent controller for TLS, you encounter this problem:
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root@mylinuxhost:~# cmk-agent-ctl register -H <host> -s <checkmk-server> -i <site> -U <username> 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://<checkmk-server>/<site>/check_mk/api/1.0/domain-types/internal/actions/discover-receiver/invoke error sending request for url (http://<checkmk-server>/<site>/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:1914: (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:1914: (unable to get local issuer certificate) error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1914: (unable to get local issuer certificate) error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1914: Error with https: Failed to discover agent receiver port from https://<checkmk-server>/<site>/check_mk/api/1.0/domain-types/internal/actions/discover-receiver/invoke error sending request for url (https://<checkmk-server>/<site>/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:1914: (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:1914: (unable to get local issuer certificate) error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1914: (unable to get local issuer certificate) error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:ssl/statem/statem_clnt.c:1914: |
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