Troubleshooting articles
Troubleshooting articles
- Walter Fisch
- Matthew Hierholzer
Owned by Walter Fisch
Last updated: Apr 11, 2025 by Matthew Hierholzer
This page lists articles related to troubleshooting Checkmk.
- Agent Updater
- Checkmk running in Docker times out while activating changes
- Common log messages from Checkmk
- Debug DCD issues
- Debug false POE SNMP values result in excessive usage percentage
- Debug invalid configuration variable df_use_fs_used_as_metric_name error
- Debug issues with inventory data disappearing/reappearing on a regular basis
- Debug predictive monitoring
- Debug Smart Ping
- LDAPS certificate Issues
- Livestatus
- TLS compatibility issues in agent updater with Checkmk 2.3 on Windows
- Troubleshooting 110 second timeouts and high memory consumption by apache
- Troubleshooting "Cannot connect to remote site: Authentication to web service" in WATO - Distributed Monitoring
- Troubleshooting "Error creating RRD: Too many links"
- Troubleshooting "Failed to start minibox thread" cmk_update_agent.checkmk.py error
- Troubleshooting "incompatible user IDs have been found" error
- Troubleshooting "invalid checker timestamp" (1970) error
- Troubleshooting "KeyError: APACHE_TCP_PORT" error
- Troubleshooting "KeyError - cmk mkeventd EventServer"
- Troubleshooting "no space left on device" or filesystem full errors
- Troubleshooting “source code string cannot contain null bytes” during activate changes
- Troubleshooting “source code string cannot contain null bytes” - Notification configuration
- Troubleshooting "undefined symbol EVP_KDF_CTX_free" error
- Troubleshooting "unknown capability to add: CAP_CAP_SYS_PTRACE" error
- Troubleshooting Apache service not starting
- Troubleshooting binding service 'already in use' error in docker
- Troubleshooting - Cannot activate changes. Another activation process is currently in progress or locked
- Troubleshooting Checkmk agent systemd service repeatedly failing on CentOS 7
- Troubleshooting CVE-Check CVE-2021-44228 Log4j is crashing on Windows
- Troubleshooting DCD - snmp_v3_credentials unknown field error
- Troubleshooting error creating configuration: 'cmk.influxdb' during Update 2.2.0 : KeyError: 'cmk.influxdb'
- Troubleshooting error running automation call restart
- Troubleshooting error sequence item 0 expected str instance bytes found
- Troubleshooting Exception: Error running automation call bake-agents (exit code 1) while baking agents
- Troubleshooting failing changes because of http/https proxies between the central and remote site
- Troubleshooting high CPU usage of the Checkmk micro core (cmc)
- Troubleshooting if hosts vanish during a vCenter update
- Troubleshooting incorrect characters displaying in graphs (SUSE only)
- Troubleshooting lack of Prometheus data after updating OpenShift 4.16 and above
- Troubleshooting LDAP issues
- Troubleshooting long-running Windows agent
- Troubleshooting missing messages in Event Console
- Troubleshooting mkeventd - Integer overflow while parsing TimeTicks in SNMP trap
- Troubleshooting Oracle / mk_oracle for Windows and Linux
- Troubleshooting overlapping clusters: "Empty output from agent at aa.bb.cc.dd:6556" error
- Troubleshooting parent/child topology in a distributed setup
- Troubleshooting pending changes error
- Troubleshooting Python 3 / SSL issue on Windows after Checkmk upgrade to 2.3
- Troubleshooting Robotmk Client side
- Troubleshooting SNMP Trap UTF-String conversion problems in Event Console
- Troubleshooting stuck or lingering downtime alerts
- Troubleshooting the agent controller
- Troubleshooting the notification path
- Troubleshooting unexpected keyword argument 'logged_out'“ error
- Troubleshooting when fetcher for host HOST times out after X seconds
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