Go to
SQL Server 2016 Configuration Manager > SQL Server Service > SQL Server (MSSQLSERVER).
– Right-click and select
Properties > select the
Startup Parameters Tab > add the value:
-m
– Restart sql > access with
Windows Authentication
– Select
Security > Logins > sa > change the password
– After changing the password, go back to the step of adding the value:
-m > remove it and restart SQL.