Werk #19228: mk-sql: no login attempts for inaccessible databases

Component

Checks & agents

Title

mk-sql: no login attempts for inaccessible databases

Date

Oct 7, 2026

Level

Prominent 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
2.5.0p16 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.4.0p38 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

When monitoring Microsoft SQL Server, the agent opened a login on every database to collect the per-database sections. If the monitoring login could not open a database, because the database was offline, restoring or access was not granted, every one of these attempts failed and filled the SQL Server error log with 18456 and 4060 messages.

Starting with this release, the agent determines up front which databases it can access and logs in to those only. Databases it cannot access are reported with an error line in the agent output, as the legacy mssql.vbs plugin did. This affects the per-database sections clusters, transactionlogs, tablespaces and datafiles; the clusters section is affected on clustered instances only.

To the list of all Werks