![]() ![]() Right click on SQL Server Instance name in SSMS and choose properties.Here, we have decided to change the Server Authentication mode from Windows Authentication to Mixed mode authentication. Or, always use windows login or Domain login account to connect to SQL Server Instance.Either Change Server Authentication mode of this SQL Server Instance to Mixed mode ( SQL Server and Windows Authentication Mode).Here we got the answer because this SQL Server instance was configured to run in only Windows Authentication mode, that is why SQL Server database engine was not allowing us to login using SQL Server login that comes in to Mixed authentication mode. When I received same MSSQL error 18456 even after entering correct login id and password then we have decided to check the server authentication mode configured for this instance. Initially, I thought login failed SQL error 18456 was reported because user might have entered wrong password, but when I tried it with correct password, it displayed same error again. The details about SQL Server error 18456 are given below with the screenshot. (Microsoft SQL Server, Error: 18456) on one of the SQL Server instance that are running in lower life cycle. Yesterday, a developer has reported an SQL Server error 18456 Login failed for user ‘username’. ![]()
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