ID: 15409 Title: Agent receiver crashes on IPv4-only Checkmk servers (regression introduced by werk 15416) Component: Checks & agents Level: 1 Class: Bug fix Version: 2.3.0b1 <a href="https://checkmk.com/werk/15416">Werk 15416</a> 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 <tt>omd status</tt>, however, it then crashed with the following error message: F+:var/log/agent-receiver/error.log [ERROR] Can't connect to ('::', 8000) F-: