Question
If I'm using a domain account to connect to SQL Server, what could cause error 18456?
Asked by: USER2412
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85 Answers
Answer (85)
Even when using domain accounts, error 18456 can occur if the domain account doesn't have the necessary permissions within SQL Server. Ensure the domain account has been mapped to a SQL Server login and has appropriate database access rights. Also, verify Kerberos delegation is configured correctly if the application is accessing resources on a different server.