Database cannot be connected

What I use is the following method: First open sql server management studio, a connection window will appear, log in with windows identity first. After entering the database, the location indicated by the arrow. Using your mouse, click the right mouse button. Go into server properties. Select Security in the properties interface. Select SQL Server and Windows Authentication Mode on the right. Just click OK. Open security on the SQL Server main page, and you will see the login name on the right. Double-click sa within the login name. Enter the properties of sa. Reset sa's password in the sa attribute. After setting the password, click OK. At this time, minimize the SQL Server window. The point is: Remember the sa password and open sql management studio, select sql identity, click Connect, you can see all the databases on this machine. Right-click on the database label, select restore database, ignore the target database, directly select the source device, point the location to C:/ProgramData/AspenTech/Aped, fill in APV84 in the file name, and then confirm. The target database can then select APV84. Okay, let's restore it. The same goes for the other two FACTV84 and NISTV84. The location is the same as APV84. Just change it when filling in the file name. At this time, the database has been loaded correctly. 4 This step is mainly set in the DatabaseManager in aspen properties. Right-click register database, and a dialog box will appear. Server name fills in the database name, such as boss\sqlserver (the server name on your own machine) login name: sa password: The password set in the second step will appear. Three databases APV84, FACTV84, and NISTV84 will be loaded.