MX Appliance Uplink Loss and Latency is showing null value and service check time out

Badal · November 25, 2023, 3:08pm

‘’**CMK version:- 2.0.0p11 (CRE)
**OS version: Linux 3.10.0-1160.95.1.el7.x86_64 #1 SMP Mon Jul 24 13:59:37 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

**Error message:Service:

MX Appliance Uplink Loss and Latency
State: WARNING
Time: Sat Nov 25 12:34:00 CET 2023
Description: (null)
Service: MX Appliance Uplink Loss and Latency
State: CRITICAL
Time: Fri Nov 24 14:02:14 CET 2023
Description: (Service Check Timed Out)

**Output of “cmk --debug -vvn hostname”:OMD[barenbrug]:~$ cmk --debug -vvn BRG01-AR01-FW01
Checkmk version 2.0.0p11
Try license usage history update.
Trying to acquire lock on /omd/sites/barenbrug/var/check_mk/license_usage/next_run
Got lock on /omd/sites/barenbrug/var/check_mk/license_usage/next_run
Trying to acquire lock on /omd/sites/barenbrug/var/check_mk/license_usage/history.json
Got lock on /omd/sites/barenbrug/var/check_mk/license_usage/history.json
Next run time has not been reached yet. Abort.
Releasing lock on /omd/sites/barenbrug/var/check_mk/license_usage/history.json
Released lock on /omd/sites/barenbrug/var/check_mk/license_usage/history.json
Releasing lock on /omd/sites/barenbrug/var/check_mk/license_usage/next_run
Released lock on /omd/sites/barenbrug/var/check_mk/license_usage/next_run
Failed to lookup IPv4 address of BRG01-AR01-FW01 via DNS: [Errno -2] Name or service not known’‘’

bkuhn · November 25, 2023, 5:49pm

Hi Badal,

the error you posted is: “Failed to lookup IPv4 address of BRG01-AR01-FW01 via DNS: [Errno -2] Name or service not known”, see the last line.

This means that the IP of the Hostname is no longer in the DNS, that could be the reason for your problem.

Badal · November 27, 2023, 7:29am

Thank you for your email. I want to inform you that the DNS address for the hostname is indeed present. However, there have been instances where a service check timeout occurs, leading to the generation of alerts. We are actively investigating this issue to prevent any future service disruptions.