SQL SERVER 登陆错误：18456

 SQL Windows身份登录失败,错误码:18456

先用sa进入

EXEC xp_instance_regread N'HKEY_LOCAL_MACHINE', N'SOFTWARE\Microsoft\Microsoft SQL Server\MSSQLServer', N'LoginMode'

-- 启用TCP/IP协议
EXEC xp_instance_regwrite N'HKEY_LOCAL_MACHINE', N'SOFTWARE\Microsoft\Microsoft SQL Server\MSSQLServer\SuperSocketNetLib\Tcp', N'Enabled', REG_DWORD, 1

//查询登录账户
SELECT name,type_desc,is_disabled
FROM sys.server_principals
WHERE type_desc = 'WINDOWS_LOGIN' AND name = 'your_windows_account';

创建登录账户

CREATE LOGIN [LAPTOP-46N8T2QN\Administrator] FROM WINDOWS