Explore the latest product updates and best practices at our hybrid Checkmk Conference #12 from June 16-18, 2026 – Register here

Werk #15409: Agent receiver crashes on IPv4-only Checkmk servers (regression introduced by werk 15416)

Component Checks & agents
Title Agent receiver crashes on IPv4-only Checkmk servers (regression introduced by werk 15416)
Date Mar 7, 2023
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.1.0p24 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Werk 15416 introduced a regression which caused the agent receiver to crash on IPv4-only Checkmk servers. After starting, the receiver was initially reported as running for a brief amount of time by omd status, however, it then crashed with the following error message: var/log/agent-receiver/error.log

[ERROR] Can't connect to ('::', 8000)

To the list of all Werks