Troubleshooting

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	4951	October 31, 2019
About the Troubleshooting category	3	1776	October 30, 2019
How to disable "Verification: unable to get local issuer certificate"	3	67	January 21, 2026
Misleading comparison of lower bounds as opposed to upper bounds	0	9	January 21, 2026
HostSectionParser: Ignoring invalid data b'<<<app-proxmox>>>' checkmk-raw , proxmox	9	35	January 21, 2026
Python2 Agent Plugins vanished after migration to 2.3.0p42 checkmk-enterprise , logwatch	0	14	January 21, 2026
REST API exception in crash.info checkmk-v2-2	1	19	January 20, 2026
Since upgrade to 2.3.0 the BI isn't working anymore checkmk-v2-2	24	515	January 20, 2026
Distributed monitoring upgrade 2.2-2.3 checkmk-v2-2	17	102	January 20, 2026
Error in distributed monitoring setup checkmk-enterprise	3	31	January 20, 2026
Migrate HTML email TypeError: argument of type 'NoneType' is not iterable checkmk-enterprise , checkmk-v2-3 , checkmk-v2 , checkmk-v2-4 , notifications	2	16	January 20, 2026
Notifications for clustered services on a virtual host checkmk-enterprise , notifications	2	27	January 19, 2026
Time offset / Time out of sync notifications , checkmk-appliance	23	1529	January 19, 2026
Windows agent repeatedly loosing connection checkmk-enterprise , checkmk-v2-2	3	143	January 16, 2026
Https check with SSO: "Could not connect to xxx within specified timeout: 10 seconds" checkmk-enterprise , checkmk-v2	2	41	January 15, 2026
Rittal LCP Water flow: Cannot calculate graph recipes checkmk-enterprise	5	71	January 13, 2026
[BUG] piggyback-hub - crash if non ascii characters present in agent output	9	62	January 13, 2026
Agent Bakery crashes agent , checkmk-v2	2	80	January 12, 2026
Warning - Raid Controller Lenovo SR650v3 Server	9	55	January 12, 2026
Several Ubiquiti Unifi Switchports in operational state unknown after update of Unifi Network Application and Switch Firmware checkmk-enterprise , checkmk-v2 , checkmk-v2-2 , checkmk-v2-1	2	31	January 12, 2026
Issues with multiple mount points for same partition? Getting "Mount options XYZ: Item not found in monitoring data" docker	2	36	January 10, 2026
Login via 1password password manager checkmk-enterprise , checkmk-v2-4 , docker	3	52	January 9, 2026
OPENSSL_3.2.0’ not found checkmk-v2 , checkmk-v2-2	3	68	January 9, 2026
HANA Pacemaker cluster monitoring - additional result from other node	4	49	January 8, 2026
Reschedule via API	8	70	January 7, 2026
Adapt WARN/CRIT thresholds for time since last update check	0	22	January 7, 2026
Custom SQL with Checkmk Cloud Edition fails on PDB	0	28	January 7, 2026
Restore Site end with error	4	34	January 6, 2026
ESX checks stale with multiple piggyback sources checkmk-v2-4 , piggyback	0	27	January 6, 2026
PING (check_icmp): rtmin is always zero	14	160	January 6, 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…