ZABBIX Forums - Zabbix Troubleshooting and Problems

Zabbix server is not running: the information displayed may not be... (split servers)

Jaceqp — Fri, 10 Apr 2026 08:06:51 GMT

Hi there.
I'm trying to troubleshoot my split zabbix environment. I've had everything up'n'running on all-in-one zabbix srv. Then I created separate servers for frontend and DB, created empty DB and restored backup into it. I guess I tweaked all conf files as expected, reconfigured GUI using IP/zabbix/config.php - went smoothly, no issues connecting to DB...

Anything else to check?

zabbix 7.4.2 + postgresql 17

PS. Here's some issue connecting to DB in logs (kinda weired since gui configurator shows no issues):

Code:

801:20260410:100002.350 database is down: reconnecting in 10 seconds
801:20260410:100012.366 [Z3001] connection to database 'zabbix' failed: [0] FATAL:  password authentication failed for user "zabbix"

Graph widget data set aggregation uses the last colour in a list instead of the first

Ace — Thu, 09 Apr 2026 10:21:59 GMT

Hello,

As you know, when selecting a data set color in graph widget, further items get assigned a different color by approximation. However the issue is when you aggregate the data set, the resulting color is not the first color which is what you assigned specifically, but the last color of the list of items, which is completely different and often a much darker shade.

I find currently in version 6LTS and plan to upgrade to 7LTS, does anyone know if this issue has been fixed in future versions or if there is a way to change this behavior with a php file edit?

BR

Zabbix Agent 2 Crashing seemingly due to Perflib/BITS errors

jamesonjjameson — Tue, 07 Apr 2026 15:42:41 GMT

I am encountering an issue with Zabbix Agent 2 crashing which seemingly correlates to errors with Perflib and BITS as shown below in aevent viewer. This has occurred on both Zabbix Server/Agent 2 versions 7.0.24 and 7.0.23 (LTS, OpenSSL, MSI) . on both Windows Server 2019 and 2025. We have attempted the usual SFC / DISM repairs along with rebuilding lodctr, though this seemingly still does not resolve the issue. Curious if anyone else is encountering anything similar?

Zabbix agent2 installation failed on Windows server 2022

zhelembai — Wed, 01 Apr 2026 07:16:20 GMT

Hi All,

We have facing a problem with installation of Zabbix agent 2 7.0.24 MSI and archive package as well on multiple Windows server 2022. It is the same issue on all Windows servers. (link for agent: https://cdn.zabbix.com/zabbix/binari...64-openssl.msi)

Error message:
"zabbix_agent2: ERROR: Failed to open event log: Access is denied."

We have tried with administrative privileges and also from elevated command line. No success yet.
Do you have any suggestion how to move on with this problem?

Thank you very much for your kind help!
Regards,
Zoltán

zabbix[host,agent,available] Zabbix Agent Availability interruptions

IgorPMAAA — Thu, 26 Mar 2026 14:49:25 GMT

Hello,
I am monitoring besides other servers, a group of servers that are in DMZ behind a firewall.
All works well, besides ... zabbix[host,agent,available] with one of the servers. Looks like data for all other items are collected correctly and with no interruption.

In comparison this is agent availability of another server of this group in DMZ.

This happened AFTER we switched on a module on the firewall for DDOS protection.
Switch module DDOS protection off - no agent availability interrupts.
Switch module DDOS protection on - agent availability interruptions start again, but ONLY for THIS server.

We have opened a support request for the firewall, but other than packet capturing and "what does agent availability do" not much has been resolved.

We have even put an exception in the DDOS protection rule, but that did not help either.

Two are then my questions:

Q1: Have other experienced problems with agent availability over a firewall? What was the solution if one has been found?

Q2: I have read documentation and from what I understand this communication is necessary. But is it safe to tweak the parameters in this particular case to be less sensitive (like waiting more time until raising the error)?

Thank you for your comments.
Kind regards

Apparmor, services and Ubuntu 24

pineapple — Wed, 25 Mar 2026 21:45:27 GMT

Hi guys,
I'm having an issue with enabling systemd units monitoring. I'm using the built it template and having apparmor enabled. Everything works fine (CPU, memory...) just those damn services won't start. I'm running agent2 v7.0.24.
Could someone have a look at my apparmor policy, please? Maybe I'm just missing a typo xD

I'm getting the following in journal -b -f:

audit: type=1107 audit(1774474988.000:126): pid=777 uid=101 auid=4294967295 ses=4294967295 subj=unconfined msg='apparmor="DENIED" operation="dbus_method_call" bus="system" path="/org/freedesktop/systemd1" interface="org.freedesktop.systemd1.Manager" member="ListUnits" mask="send" name="org.freedesktop.systemd1" pid=813 label="/usr/sbin/zabbix_agent2" peer_pid=1 peer_label="unconfined"

include

# vim:syntax=apparmor
# AppArmor policy for zabbix_agent2

/usr/sbin/zabbix_agent2 {
include
include
include
include
include
include

/dev/ r,
/etc/dpkg/dpkg.cfg.d/ r,
/etc/zabbix/** r,
/etc/zabbix/scripts/raspberrypi.sh mrix,
/proc/ r,
/proc/** r,
/sys/class/net/** r,
/sys/devices/** r,
/usr/bin/** mrix,
/usr/sbin/zabbix_agent2 r,
/{,var/}run/utmp rk,
owner /proc/*/mounts r,
owner /run/zabbix/zabbix_agent2.pid wk,
owner /var/log/zabbix/zabbix_agent2.log w,

dbus send
bus=system
path=/org/freedesktop/systemd1/**
interface=org.freedesktop.systemd1.Manager
member=ListUnits
peer=(label=unconfined),

dbus send
bus=system
path=/org/freedesktop/systemd1/**
interface=org.freedesktop.systemd1.Manager
member=*
peer=(label=unconfined),
}

Mysql server crashing

galavichid — Wed, 25 Mar 2026 11:18:16 GMT

Hi,

I have 2x environments with Zabbix 7.4 + MySQL running on Ubuntu 24.04.
Since the installation I have an issue on both of the server which causing the MySQL server to not reload.
It seems to happen every end of the month, so I have looked for some jobs which might causing the issue, and try to investigate a lot and change different settings but it still happens.
I am wondering if someone have better idea which I couldn't think of or any AI chatbot.

Thank you
Gal

Issue when using external script to monitor certificate expiration

Scrabbi — Mon, 23 Mar 2026 15:55:30 GMT

Hello,

I have created a small script to check how many days I have left before my website certificates expires. When I execute my script using the user "zabbix" (which is the one used when an external script is used if I understood well) on my zabbix server, the script works fine and I get the number of days before expiration. However, once I create a host with a template, I get " Could not read certificate from /tmp/tmp.xxxxxx unable to load certificate 0".

Here you can find the script and the item :
The name of the host is "mysite.com" and is monitored by my zabbix server :
I found the script here : https://askubuntu.com/questions/1198...s-in-a-website

I did a bit of troubleshooting, and when I execute the script form my server, the tmp file is created and contains the certificate, but if it's from the item, the tmp file is empty.

I don't really know how to go from here, any help would be greatly appreciated.

Scrabbi

Issue when using external script to monitor certificate expiration

Scrabbi — Mon, 23 Mar 2026 15:53:39 GMT

zabbix db character set conversion/recommendations

Jaceqp — Fri, 20 Mar 2026 08:58:53 GMT

Hi there.
I've just created empty MySQL zabbix DB using

Code:

create database zabbix character set utf8mb4 collate utf8mb4_bin;

then restored DB using sql file from another server (create DB not included in script).

Code:

mysql -uroot -p zabbix < /somepath/somefile.sql

After restoring DB and checking SELECT @@character_set_database, @@collation_database; shows:

Code:

MariaDB [zabbix]> SELECT @@character_set_database, @@collation_database;
+--------------------------+----------------------+
| @@character_set_database | @@collation_database |
+--------------------------+----------------------+
| utf8mb3                  | utf8mb3_bin          |
+--------------------------+----------------------+

Seems charset is included in .sql itself. Shall I convert DB to utf8umb4 anyway or leave it as it is?

In "Latest Data" one of three hosts disappear: limit in displaying data or bug?

IgorPMAAA — Fri, 20 Mar 2026 08:10:41 GMT

Hi, I am using Zabbix with no contract, so I cannot write a bug report and I am not sure that it is a bug.

Situation: VMware virtual server with SUSE Linux Enterprise Server 15 SP6
Registered TEST with Zabbix and started to monitor, worked fine.

This week development asked to create STAGEING and PRODUCTION server.
Being a VM I just cloned TEST -> STAGEING, started monitoring, worked fine.

Later I cloned STAGEING -> PRODUCTION. So all three servers are essentially the same. Started monitoring, worked fine.

I went to the page "Monitoring/Latest data" and selected the host group all three servers are in: two appear in the page with data, one not.
If I chose all three of them servers in the host field, two appear with data, one not.

So my question is, if this is a bug or if there is a limit on number of items/tags I can concurrently display on the Monitoring/Latest data page ...

Thank you for shedding light on this.
Kind regards

Having two items with value xy and trigger which tests if they are the same

riBoon — Thu, 19 Mar 2026 15:41:47 GMT

Hi,
I have a race condition in my trigger.
I have two items checking at defined schedule time getting a value which is the correct value for today. But we have to make sure they are the same.

So my trigger expression looks like:
last(item1)<>last(item2)

And what I get is a problem alert with duration 0s as the first item creates the problem (values differ), the second switches it to ok.

Is there an easy way to get this done?

repo.zabbix.com unavailable via IPv6 2604:a880:2:d0::2062:d001

beat — Sun, 15 Mar 2026 08:08:11 GMT

Hi

Since at least yesterday 14.03.2026 repo.zabbix.com is unavailable via IPv6 2604:a880:2:d0::2062:d001.
I tested it over different connections. Is this issue known?

Many thanks
Beat