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Applies to: 
SQL Server
Details
| Attribute | Value |
|---|---|
| Product Name | SQL Server |
| Event ID | 15404 |
| Event Source | MSSQLSERVER |
| Component | SQLEngine |
| Symbolic Name | SEC_NTGRP_ERROR |
| Message Text | Could not obtain information about Windows NT group/user 'user', error code code. |
Explanation
SQL Server uses event 15404 during authentication when an invalid principal is specified. Or, impersonation of a Windows account fails because there's no full trust relationship between the SQL Server service account and the ___domain of the Windows account.
User Action
Check that the Windows principal exists and isn't misspelled.
If this error results from a lack of a full trust relationship between the SQL Server service account and the ___domain of the Windows account, one of the following actions can resolve the error:
Use an account from the same ___domain as the Windows user for the SQL Server service.
If SQL Server is using a machine account such as Network Service or Local System, the machine must be trusted by the ___domain containing the Windows User.
Use a SQL Server account.
If you use a ___domain account for the SQL Server service, ensure that ___domain account isn't locked out from Active Directory.