Agent 1.21.0p22 - connection refused - ubuntu 22.04

Troubleshooting
1

CMK version:
2.1.0p22
OS version:
ubuntu 22.04
Error message:
telnet: Unable to connect to remote host: Connection refused
Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)
OMD[monitoring]:~$ cmk --debug -vvn psbecmk1
Checkmk version 2.1.0p22
Try license usage history update.
Trying to acquire lock on /omd/sites/monitoring/var/check_mk/license_usage/next_run
Got lock on /omd/sites/monitoring/var/check_mk/license_usage/next_run
Trying to acquire lock on /omd/sites/monitoring/var/check_mk/license_usage/history.json
Got lock on /omd/sites/monitoring/var/check_mk/license_usage/history.json
Next run time has not been reached yet. Abort.
Releasing lock on /omd/sites/monitoring/var/check_mk/license_usage/history.json
Released lock on /omd/sites/monitoring/var/check_mk/license_usage/history.json
Releasing lock on /omd/sites/monitoring/var/check_mk/license_usage/next_run
Released lock on /omd/sites/monitoring/var/check_mk/license_usage/next_run
Updating IPv4 DNS cache for psbecmk1: 127.0.0.1
Trying to acquire lock on /omd/sites/monitoring/var/check_mk/ipaddresses.cache
Got lock on /omd/sites/monitoring/var/check_mk/ipaddresses.cache
Releasing lock on /omd/sites/monitoring/var/check_mk/ipaddresses.cache
Released lock on /omd/sites/monitoring/var/check_mk/ipaddresses.cache

  • FETCHING DATA
    Source: SourceType.HOST/FetcherType.PIGGYBACK
    [cpu_tracking] Start [7f0fbf8bd340]
    [PiggybackFetcher] Fetch with cache settings: NoCache(psbecmk1, base_path=/omd/sites/monitoring/tmp/check_mk/data_source_cache/piggyback, max_age=MaxAge(checking=0, discovery=120, inventory=120), disabled=True, use_outdated=False, simulation=False)
    Not using cache (Cache usage disabled)
    [PiggybackFetcher] Execute data source
    No piggyback files for ‘psbecmk1’. Skip processing.
    No piggyback files for ‘127.0.0.1’. Skip processing.
    Not using cache (Cache usage disabled)
    [cpu_tracking] Stop [7f0fbf8bd340 - Snapshot(process=posix.times_result(user=0.0, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.0))]
  • PARSE FETCHER RESULTS
    Source: SourceType.HOST/FetcherType.PIGGYBACK
    No persisted sections
    → Add sections: []
    Received no piggyback data
    [cpu_tracking] Start [7f0fbf8bd430]
    value store: synchronizing
    Trying to acquire lock on /omd/sites/monitoring/tmp/check_mk/counters/psbecmk1
    Got lock on /omd/sites/monitoring/tmp/check_mk/counters/psbecmk1
    value store: loading from disk
    Releasing lock on /omd/sites/monitoring/tmp/check_mk/counters/psbecmk1
    Released lock on /omd/sites/monitoring/tmp/check_mk/counters/psbecmk1
    No piggyback files for ‘psbecmk1’. Skip processing.
    No piggyback files for ‘127.0.0.1’. Skip processing.
    [cpu_tracking] Stop [7f0fbf8bd430 - Snapshot(process=posix.times_result(user=0.0, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.0))]
    execution time 0.0 sec | execution_time=0.000 user_time=0.000 system_time=0.000 children_user_time=0.000 children_system_time=0.000 cmk_time_agent=0.000

on another one
OMD[monitoring]:~$ cmk --debug -vvn ogramos01
Checkmk version 2.1.0p22
Try license usage history update.
Trying to acquire lock on /omd/sites/monitoring/var/check_mk/license_usage/next_run
Got lock on /omd/sites/monitoring/var/check_mk/license_usage/next_run
Trying to acquire lock on /omd/sites/monitoring/var/check_mk/license_usage/history.json
Got lock on /omd/sites/monitoring/var/check_mk/license_usage/history.json
Next run time has not been reached yet. Abort.
Releasing lock on /omd/sites/monitoring/var/check_mk/license_usage/history.json
Released lock on /omd/sites/monitoring/var/check_mk/license_usage/history.json
Releasing lock on /omd/sites/monitoring/var/check_mk/license_usage/next_run
Released lock on /omd/sites/monitoring/var/check_mk/license_usage/next_run

  • FETCHING DATA
    Source: SourceType.HOST/FetcherType.TCP
    [cpu_tracking] Start [7fad960a7910]
    [TCPFetcher] Fetch with cache settings: DefaultAgentFileCache(ogramos01, base_path=/omd/sites/monitoring/tmp/check_mk/cache, max_age=MaxAge(checking=0, discovery=120, inventory=120), disabled=False, use_outdated=False, simulation=False)
    Not using cache (Does not exist)
    [TCPFetcher] Execute data source
    Connecting via TCP to 192.168.11.110:6556 (5.0s timeout)
    Closing TCP connection to 192.168.11.110:6556
    [cpu_tracking] Stop [7fad960a7910 - Snapshot(process=posix.times_result(user=0.0, system=0.0, children_user=0.0, children_system=0.0, elapsed=5.009999997913837))]
    Source: SourceType.HOST/FetcherType.SNMP
    [cpu_tracking] Start [7fad960a73d0]
    [SNMPFetcher] Fetch with cache settings: SNMPFileCache(ogramos01, base_path=/omd/sites/monitoring/tmp/check_mk/data_source_cache/snmp, max_age=MaxAge(checking=0, discovery=120, inventory=120), disabled=False, use_outdated=False, simulation=False)
    Not using cache (Does not exist)
    [SNMPFetcher] Execute data source
    Write data to cache file /omd/sites/monitoring/tmp/check_mk/data_source_cache/snmp/checking/ogramos01
    Trying to acquire lock on /omd/sites/monitoring/tmp/check_mk/data_source_cache/snmp/checking/ogramos01
    Got lock on /omd/sites/monitoring/tmp/check_mk/data_source_cache/snmp/checking/ogramos01
    Releasing lock on /omd/sites/monitoring/tmp/check_mk/data_source_cache/snmp/checking/ogramos01
    Released lock on /omd/sites/monitoring/tmp/check_mk/data_source_cache/snmp/checking/ogramos01
    [cpu_tracking] Stop [7fad960a73d0 - Snapshot(process=posix.times_result(user=0.010000000000000009, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.010000001639127731))]
    Source: SourceType.HOST/FetcherType.PIGGYBACK
    [cpu_tracking] Start [7fad96119fd0]
    [PiggybackFetcher] Fetch with cache settings: NoCache(ogramos01, base_path=/omd/sites/monitoring/tmp/check_mk/data_source_cache/piggyback, max_age=MaxAge(checking=0, discovery=120, inventory=120), disabled=True, use_outdated=False, simulation=False)
    Not using cache (Cache usage disabled)
    [PiggybackFetcher] Execute data source
    No piggyback files for ‘ogramos01’. Skip processing.
    No piggyback files for ‘192.168.11.110’. Skip processing.
    Not using cache (Cache usage disabled)
    [cpu_tracking] Stop [7fad96119fd0 - Snapshot(process=posix.times_result(user=0.0, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.0))]
  • PARSE FETCHER RESULTS
    Source: SourceType.HOST/FetcherType.TCP
    → Not adding sections: timeout(‘timed out’)
    Source: SourceType.HOST/FetcherType.SNMP
    No persisted sections
    → Add sections: []
    Source: SourceType.HOST/FetcherType.PIGGYBACK
    No persisted sections
    → Add sections: []
    Received no piggyback data
    Received no piggyback data
    Received no piggyback data
    [cpu_tracking] Start [7fad96119af0]
    value store: synchronizing
    Trying to acquire lock on /omd/sites/monitoring/tmp/check_mk/counters/ogramos01
    Got lock on /omd/sites/monitoring/tmp/check_mk/counters/ogramos01
    value store: loading from disk
    Releasing lock on /omd/sites/monitoring/tmp/check_mk/counters/ogramos01
    Released lock on /omd/sites/monitoring/tmp/check_mk/counters/ogramos01
    No piggyback files for ‘ogramos01’. Skip processing.
    No piggyback files for ‘192.168.11.110’. Skip processing.
    [cpu_tracking] Stop [7fad96119af0 - Snapshot(process=posix.times_result(user=0.0, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.0))]
    [agent] timeout(‘timed out’)(!!), [snmp] Success, execution time 5.0 sec | execution_time=5.020 user_time=0.010 system_time=0.000 children_user_time=0.000 children_system_time=0.000 cmk_time_agent=5.010 cmk_time_snmp=0.000

i got “connection refused” errno 111
even with local command: telnet localhost 6556

do you any hint ?

thank you in advance,

Eric

2

I found a problem for 2 of my hosts: xinetd was not 100% working

but i stay with the following:

command: cmk -d hostname gives: ERROR [agent]: Communication failed: [Errno 111] Connection refused

3

Hi @lecocqe,

are you sure xinetd is working correctly now?

Can you share the output of “ss -tlpn | grep 6556” (run as root)?

Gerd

4

Hi,

LISTEN 0 4096 *:6556 *:* users:(("cmk-agent-ctl",pid=867,fd=9))

best regards,

5

ok, so it’s not using xinetd after all :slight_smile:

does your host have a local firewall?
can you access the port 6556 externally ie. using “nc 6556” ?

6

today sudo ss -tlpn | grep 6556 returns nothing

so frustrating
thank for your help

7

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