CMK version: 2.5.0p13
OS version: Debian Trixie
Error message: Unhandled exception: 400: Site connection not initiated ([Errno 104] Connection reset by peer).
all connections are lost in distributed monitoring after updating checkmk-pro from 2.5.0p11 to 2.5.0p13. Port 6557 is open on all sites, sites components are running. in liveproxyd.log
Could not send heartbeat for 10 secs - no free channel
although Maximum concurrent Livestatus connections ist set to 100, an increase didn’t help neither, telnet from master to remote doesn’t work neither.
~$ ss -tan state established '( sport = :6557 )' | wc -l
1
~$ telnet slave01 6557
Trying 192.168.1.12...
Connected to slave01.
Escape character is '^]'.
Connection closed by foreign host.
~$ netstat -tulpn | grep 6557
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp6 0 0 :::6557 :::* LISTEN 34433/xinetd
master is still logged in to all remote sites bit is connected. The community update went without any issues.
web.log has many such entries
2026-09-14 06:59:15,408 [40] [cmk.web 42824] Failed to fetch peer certificate
Traceback (most recent call last):
File "/omd/sites/$master/lib/python3/cmk/gui/wato/pages/sites.py", line 1954, in page
cert_details = list(self._fetch_certificate_details())
File "/omd/sites/$master/lib/python3/cmk/utils/encryption.py", line 71, in fetch_certificate_details
verify_chain_results = _fetch_certificate_chain_verify_results(
trusted_ca_file, address_family, address
)
File "/omd/sites/$master/lib/python3/cmk/utils/encryption.py", line 109, in _fetch_certificate_chain_verify_results
sock.do_handshake()
~~~~~~~~~~~~~~~~~^^
File "/omd/sites/$master/lib/python3.13/site-packages/OpenSSL/SSL.py", line 2487, in do_handshake
self._raise_ssl_error(self._ssl, result)
~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
File "/omd/sites/$master/lib/python3.13/site-packages/OpenSSL/SSL.py", line 2074, in _raise_ssl_error
raise SysCallError(errno, errorcode.get(errno))
OpenSSL.SSL.SysCallError: (104, 'ECONNRESET')
and now I got this error:
Got invalid data:
Internal automation error: too many values to unpack (expected 2)
Traceback (most recent call last):
File "/omd/sites/remote01/lib/python3/cmk/gui/wato/pages/automation.py", line 302, in _execute_automation_command
response.set_data(repr(automation.execute(automation.get_request(config, request))))
~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/omd/sites/remote01/lib/python3/cmk/gui/watolib/automation_commands.py", line 83, in execute
"omd_status": self._get_omd_status(),
~~~~~~~~~~~~~~~~~~~~^^
File "/omd/sites/remote01/lib/python3/cmk/gui/watolib/automation_commands.py", line 76, in _get_omd_status
return self._parse_omd_status(result.stdout)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
File "/omd/sites/remote01/lib/python3/cmk/gui/watolib/automation_commands.py", line 61, in _parse_omd_status
status = {key: int(val) for key, val in (el.split(" ") for el in raw_status.splitlines())}
^^^^^^^^
ValueError: too many values to unpack (expected 2)
Any ideas what went wrong here?