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SQL Server Error 18456 Fixes
data-recovery-solutions.com/blog/login-failed-for-user-microsoft-sql-server-error-18456/Yapay zekadan makale özeti
- Error Overview
- Error 18456 indicates failed login attempt in SQL Server
- Primary cause is incorrect password entry
- Detailed information available in event log
- Error States
- State 1: Authentication failure
- States 2-5: Incorrect or invalid userid
- State 6: Windows login as SQL Server account
- State 7: Login disabled
- States 8-9: Incorrect or expired password
- States 11-12: Valid credentials but server access failed
- Solutions
- Enable SQL Server Authentication in Server Properties
- Set up Windows Authentication with admin rights
- Verify server roles and add sysadmin
- Restart SQL Server after making changes