Werk #22434: vsphere: replace macros in the custom host name for SSL certificate checking

Component	Checks & agents
Title	vsphere: replace macros in the custom host name for SSL certificate checking
Date	Nov 2, 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 2.5.0p19 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p40 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

In the rule "VMware ESX via vSphere", the option "SSL certificate checking" set to "Use other host name" states that it supports macros such as $HOSTNAME$, $HOSTALIAS$ and $HOSTADDRESS$. The macros were never replaced, so the special agent validated the certificate against the literal text and failed with an error like:

CertificateError("hostname '$HOSTNAME$.example.com' doesn't match 'vcenter.example.com'")

The macros in this field are now replaced with the values of the monitored host.

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