Release Notes for Zabbix 4.0.28rc1

Zabbix Team is pleased to announce the availability of Zabbix 4.0.28rc1.

Zabbix is an enterprise-class open source distributed monitoring solution. Zabbix is released under the GPL, thus it is free of charge for both commercial and non-commercial use. A complete text of the license is available at

This document contains the release notes for Zabbix 4.0.28rc1. Download it from download.

The following sections describe the release in details and provide late-breaking or other information that supplements its main documentation.

New Features and Improvements

ZBXNEXT-6364 Removed long lists of cloned objects from host and template full clone forms Frontend
ZBXNEXT-6307 Added ability to read properties from a file Java gateway

Bug Fixes

ZBX-18942 Fixed missing SID valiadion in authentication update route Frontend
ZBX-18893 Changed frontend config file permissions to 0600 Frontend
ZBX-18884 Fixed crash in web monitoring and* keys when encoding non ASCII characters in URL Agent Proxy Server
ZBX-18865 Fixed dbConditionInt ( returning wrong result in rare cases API Frontend
ZBX-16216 Fixed semaphore not being cleaned up when stopping Zabbix agent Agent
ZBX-18556 Fixed gaps in time labels of classic graphs related to DST transitions Frontend
ZBX-18644 Replaced deprecated gethostbyname function with getaddrinfo Agent Proxy Server
ZBX-18802 Fixed close problem task to be deleted when problem event is deleted Server
ZBX-17865 Fixed displaying of long problem names on problems and event pages Frontend
ZBX-18796 Improved update performance of the preprocessing rules in item.update() and itemprototype.update() methods API
ZBX-18623 Fixed the global search showing number of objects that user has no permissions Frontend
ZBX-18784 Fixed memory leak when handling vmware events Proxy Server
ZBX-18761 Fixed possible heap overflow issues in IPC commonications when deserializing huge text values Proxy Server
ZBX-18755 Fixed possibility of out of memory error when replacing string in mail, calculated checks, actions and when linking template Proxy Server
ZBX-18486 Fixed screen inheritance from a linked template in the full clone case Frontend
ZBX-18660 Fixed SNMP index returning as a number instead of string if there is a backslash Server
ZBX-17703 Fixed problem negative duration for timed triggers in case of database disconnect Server
ZBX-18694 Fixed crash when PSK connection is configured but PSK or PSK identity is empty Proxy Server
ZBX-18662 Improved pollers, unreachable pollers, Java pollers and pingers to use less memory Proxy Server
ZBX-18423 Fixed inconsistent macro expansion with Oracle DB compared with other databases Server
ZBX-18219 Fixed custom multiplier preprocessing step validation to accept a string with macros API
ZBX-18422 Fixed "server is not running" warning message width Frontend
ZBX-18688 Fixed schema name didnt show when available only postgresql Frontend

Installation and Upgrade Notes


See Zabbix documentation for full details.


See Upgrade procedure for upgrade options and instructions. For version specific upgrade notes, see Upgrade notes for 4.0.28.

Commercial support

Zabbix Company provides a full range of Professional Services. We also provide trouble-free Upgrade Service for easy migration from earlier versions of Zabbix. Please Contact sales for pricing and more details.


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