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 Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.1.0p24 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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)

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