Release Notes for Zabbix 4.0.20rc1

Zabbix Team is pleased to announce the availability of Zabbix 4.0.20rc1.

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 4.0.20rc1. 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-4829 Changed web setup wizard to not create and drop tables for DB connectivity test purposes Frontend

Bug Fixes

ZBX-17524 Fixed time selector button state Frontend
ZBX-17496 Fixed UserMacro API validation API
ZBX-17532 Added css files and sprites versioning by query strings Frontend
ZBX-17501 Fixed overlapping multiselect suggest with browser autocomplete Frontend
ZBX-17402 Fixed search field accidentally transform value to lowercase Frontend
ZBX-17505 Fixed crash inside a fork when calling vfs.fs.inode Agent
ZBX-16959 Fixed return code check of curl_easy_setopt Server
ZBX-17423 Fixed "reset" button in history page Frontend
ZBX-17395 Fixed deletion of templated applications that were linked to items when importing templates Frontend
ZBX-17359 Fixed "sortorder": "DESC" option with multiple sortfields API
ZBX-17336 Fixed wrong error message when fping fails Proxy Server
ZBX-17427 Fixed top busiest triggers filter Frontend
ZBX-17523 Fixed agent compilation on Windows Agent
ZBX-17508 Fixed error in oracle database encoding check Frontend
ZBX-17442 Fixed to time out when there is no response Agent
ZBX-17429 Fixed trigger expression condition popup to display negative numbers upon opening existing expression Frontend
ZBX-17012 Fixed URL validator to also accept relative URLs API Frontend
ZBX-17507 Fixed oracle query interpreted as a multistatement Frontend
ZBX-9387 Fixed incorrect maintenance calculations when DST changed to summer time Server
ZBX-17390 Fixed validation of the maximum selected period Frontend
ZBX-23230 Fixed LDAP connection being initialized before permissions check Frontend

Installation and Upgrade Notes


See Zabbix指导手册。 for full details.


See 升级指南 for upgrade options and instructions. For version specific upgrade notes, see Upgrade notes for 4.0.20.

Commercial support

Zabbix Company provides a full range of Professional Services. We also provide trouble-free 升级服务 for easy migration from earlier versions of Zabbix. Please 联系我们 for pricing and more details.


Zabbix 4.0 Manual