Assume that you use Transparent Data Encryption (TDE) together with Extensible Key Management (EKM) in Microsoft SQL Server. The encryption key for a TDE-enabled database is stored in the EKM provider. If connectivity issues occur during a log flush operation, the EKM provider becomes inaccessible and the database goes offline. Additionally, a dump file is generated.
The fix for this problem is included in the following updates for SQL Server:
Cumulative Update 1 for SQL Server 2016 Service Pack 2
Cumulative Update 9 for SQL Server 2016 Service Pack 1
Cumulative Update 12 for SQL Server 2014 Service Pack 2
Even after you apply this fix, it is still possible for the database to go offline during a log flush if certain errors are returned by the EKM provider. This fix addresses connectivity issues only.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.