Latest Troubleshooting topics

Topic	Replies	Views	Activity
Troubleshooting FAQ This is a Wiki topic for troubleshooting Checkmk. Feel free to contribute! Template for troubleshooting posts Here is the post template that you can use to make your issue clearer to everyone. Just edit out the sample p…	1	5102	October 31, 2019
About the Troubleshooting category	3	1792	October 30, 2019
Host down error notification checkmk-v2	2	40	July 31, 2026
Bug Nagios logrotation or CheckMK availability report bug? checkmk-v2 , checkmk-appliance	3	76	July 31, 2026
Distributed Monitoring - No GUI Access after creating new remote site checkmk-enterprise	1	27	July 31, 2026
Windows_updates.ps1 not running checkmk-v2 , checkmk-enterprise , windows , plugin	2	37	July 31, 2026
Find unknown tags / no longer existing tags in rules hosttags	4	39	July 31, 2026
Setting up Docker container health check checkmk-enterprise , docker , robotmk	1	31	July 31, 2026
Oracle instance monitoring checkmk-v2-1	1	21	July 31, 2026
[Bug - active_checks:httpv2] Create httpv2 probes from API REST with Proxy checkmk-raw	0	17	July 30, 2026
High CPU usage after in-place upgrade from 2.1 to 2.4p34 checkmk-v2-4 , checkmk-v2-1	11	88	July 30, 2026
Fetcher helpers repeatedly exit with status 14 after memory increase, causing random 60-second timeouts	3	68	July 29, 2026
Installation Bug 2.5.0 P10? checkmk-appliance	0	37	July 29, 2026
Customization folder for notification plugins jira_issues? checkmk-v2-2 , notifications	2	70	July 28, 2026
Mk_apt holding apt database lock indefinitely	3	42	July 28, 2026
Check-mk-enterprise-2.4.0p34-el9-38.x86_64: /omd/sites/mysite/lib/libcrypto.so.3: version `OPENSSL_3.4.0' not found checkmk-v2-4 , checkmk-enterprise , checkmk-v2-1 , checkmk-v2 , checkmk-v2-2	3	64	July 28, 2026
Receiving wanted and not configured notifications notifications	2	37	July 27, 2026
Capturing vs. non-capturing groups in process discovery	0	26	July 27, 2026
AWS Piggyback Configuration (Use different hostname - set IP Address) aws	1	55	July 24, 2026
Growth trend - bad graph checkmk-enterprise , graphs , migration , bug	2	99	July 24, 2026
Slow folder trees with hosts since upgrade to 2.5.0p5 checkmk-v2-5	5	130	July 24, 2026
Customized dashboard - graph without curve dashboards	8	75	July 24, 2026
Update notification rule via REST API rest-api	6	52	July 23, 2026
"Disabled services" rule causes massive "Unimplemented check ... service could not be found" warnings flooding nagios.log (Nagios core) checkmk-v2-5 , checkmk-raw	3	85	July 23, 2026
Checkmk Docker Plugin not working under Ubuntu Server 26.04 plugin , docker	1	74	July 23, 2026
Updater Problem checkmk-v2 , checkmk-appliance	3	72	July 22, 2026
Log file Patterns - OOM alerts do not clear on next check checkmk-v2 , checkmk-raw	5	54	July 22, 2026
Piggyback data not processed	5	65	July 22, 2026
Source port reuse by check_httpv2 tripping on Firewall checkmk-raw	0	31	July 22, 2026
Custom Topic icons checkmk-v2-5	2	58	July 22, 2026

Troubleshooting FAQ

This is a Wiki topic for troubleshooting Checkmk. Feel free to contribute! Template for troubleshooting posts Here is the post template that you can use to make your issue clearer to everyone. Just edit out the sample p…