18456 - Login Failed for User (Microsoft SQL Server, Error: 18456). , SQL .

, , SQL. , , SQL. .
Server Manager . Tools → Computer Management:

Local Users and Groups, Computer Management → System Tools Users.

. , Built-in account for administering the computer. , , SQL.
, Administrator. .

SQL Management Studio Administrator, , , , Security → Logins. Logins New Login:

Search:

, SQL. OK:

Server Roles sysadmin OK:

Connect SQL OK.

, Administrator , . .