Werk #19704: 'Access to Livestatus via TCP' changes upon pressing save

Component	Site management
Title	'Access to Livestatus via TCP' changes upon pressing save
Date	Apr 27, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0p2 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p29 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

When configuring the Livestatus TCP port under Global settings > Access to Livestatus via TCP and then pressing Activate Changes, the actual port in use could differ from the one configured in the GUI. The root cause is that omd silently incremented the port until finding a free one. Upon reopening the setting, the GUI reflected the port that omd had actually applied.

Activation now validates the configured port before calling omd. If the port is already used, activation is aborted with an error message that names the conflicting site and the configuration key holding that port.

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