Werk #19195: mk-sql: ODBC backend supports clustered SQL Server instances

Component

Checks & agents

Title

mk-sql: ODBC backend supports clustered SQL Server instances

Date

Apr 10, 2026

Level

Prominent Change

Class

New Feature

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.5.0b5 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

When a Microsoft SQL Server instance was configured with a cluster name and connected via ODBC, the cluster name was not passed to the ODBC connection string builder. As a result, the SERVER= parameter in the connection string was set to the individual node hostname instead of the cluster virtual network name. In clustered SQL Server environments, this caused connections to fail or to target the wrong node.

Starting with this release, the ODBC connection string for clustered instances correctly uses the configured cluster name as the server address. Connections are now routed through the cluster virtual network name, matching the behaviour of TCP-based connections.

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