Werk #19469: Fix cmk-monitor-broker hanging CheckMk agent runs due to proxy misconfiguration

Component

Site management

Title

Fix cmk-monitor-broker hanging CheckMk agent runs due to proxy misconfiguration

Date

Mar 26, 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 Ultimate MT
2.5.0b3 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.4.0p26 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Previously, the cmk-monitor-broker script could cause the Checkmk agent to stall for several minutes when the monitored site ran in an environment with HTTP proxy settings configured.

Since the site name is typically not listed in no_proxy, curl would route these local requests through the configured proxy, which either rejected them (HTTP 407) or timed out without ever returning.

With this werk we now explicitly bypass the proxy for the site hostname and add a 5-second connection timeout as a safety net in case the broker is unreachable for any other reason.

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