Werk #18498: netstat: map UNCONN to CLOSED

Component	Checks & agents
Title	netstat: map UNCONN to CLOSED
Date	Jul 21, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	3.0.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0p10 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

iproute2 ss may report UNCONN as connection status. This is now mapped to CLOSED. Before this change it caused an crash with KeyError ('UNCONN')

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