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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.