Werk #14416: Agent controller: Fix agent data transport for IPv4-only hosts

Component Agent bakery
Title Agent controller: Fix agent data transport for IPv4-only hosts
Date Jun 15, 2022
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.2.0i1 2.1.0p3
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The agent controller (cmk-agent-ctl) crashed on IPv4-only hosts when attempting to open a TCP socket in order to allow Checkmk to connect to the host and collect agent data. Note that on Linux hosts, this crash only occured if IPv6 was disabled at the kernel level. The corresponding error message read

ERROR [cmk_agent_ctl] Address family not supported by protocol (os error 97)

Note that this crash only affected the transport of agent data, not the host registration.

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