Event ID 17806

  • We have had SSPI errors across a dozen servers in an hour span.


    Per the above link :

    Stuck at the very first point...

    Cause of SQL error 17806

    1.SQL Server engine account running with a Domain service account, and that account locked at the time a Kerberos connection attempt. The connection would work, but it would kick down to NTLM.

    What does it mean that an account is locked at the time a Kerberos connection attempt ? Thanks

    FYI: We have seen 17806 in the error log quite frequently across several servers.

    • This topic was modified 10 months, 3 weeks ago by  mtz676.
  • Thanks for posting your issue and hopefully someone will answer soon.

    This is an automated bump to increase visibility of your question.

  • Can somebody help me here. Thanks

  • You probably lack the SPN's for SQL server.  You can check them with the Microsoft tool:  https://www.microsoft.com/en-US/download/details.aspx?id=39046

    The tool can even generate the commands to add the missing ones.

  • Hi,

    we got this kind of error as well. We had a lot of domaincontroller. If one of them is in maintenance, or will just reboot, the sql server needs some seconds to recognize, that he had to use another domain controller.

    We don't care about the error, we got no impact on our application or databases.

    Kind regards,


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