An attempt to login using SQL authentication failed.

  • Hey:w00t:

    Bit of a strange one... Getting the following error in the log for a couple of Clients

    Error: 18456, Severity: 14, State: 58.

    Login failed for user ''. Reason: An attempt to login using SQL authentication failed. Server is configured for Windows authentication only. [CLIENT: x.x.x.x]

    SQL Server Authentication is set to Mixed Mode... Always has been... I have restarted ect

    Any ideas?

  • Are you sure nobody touched the Authentication Mode? Please verify. It can't just appear without user intervention.

  • Yeah! just checked set to SQL Server and Windows Authentication mode..

  • Are you making attempt on correct server? Please check server name / instances (named / default).

    Can you login on the server with Windows Account? Are SQL Logins enabled on Server?

  • Hello,

    As a test, what happens if you create a new SQL account and then try logging onto the instance using it ?

    Cheers

    Vultar

  • Can you please let us know, how those users are connecting to the server e.g. through application, SSMS etc? Moreover, which version of SQL Server are you using?

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