Microsoft admits SQL Servers might wobble after October update
The problem is that after the October 13 (KB5126646) update, connections created by SQL Server linked server queries might remain open.
Key points
- There might be a culprit… Microsoft has admitted that a change has caused linked server queries to fail to close connections.
- Microsoft said the issue affects SQL Server linked server queries that use OLE DB providers to connect to external databases.
- According to Microsoft, the technical glitch affects every version of Windows except Windows 11 26H2, stretching back to Windows 10 1809 and LTSC 2019, and Windows Server from 2025 back to 2012.
The October 2026 Windows Server update left some Exchange Servers wobbling until either a Registry edit was made or a fix was applied as part of the November update.
Encountered some odd SQL Server connection behavior since the October update?
Additional details
- Linked servers via OLE DB providers have been around for years and are a useful way of, for example, using additional data sources in queries.
- According to Microsoft, "As additional queries are performed, connections to external databases can accumulate instead of closing as expected.
- Microsoft, or rather the unfortunate souls responsible for administering their server products, has not had the best time of late.
- Once a provider is added, SQL Server can open a connection to grab data, and close it again when the query is complete.
- Otherwise, an out-of-band update should be along within the next few days to deal with the problem.
How this summary was made: extractive summary — built from the sources' own reporting. It is drawn only from the reporting of the sources listed below — read the originals for full detail. How we summarize →
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