User "computer name \ ASPnet" Login Failed

My solution is as follows:
1. Create a "computer name \ ASPnet" user on SQL Server. For example, if I create kingly \ ASPnet
2. Open the "Security" folder in SQL Enterprise Manager, right-click "Log on", and select "New login ......". On the "General" tab, set "name" to kingly \ ASPnet. For other default items, click the "database access" tab to specify the database to be accessed. On the "database access" tab, assign the following permissions to the database: DBO, public, and db_owner are enough.