How to quickly and effectively solve the problem of database connection failure

Unable to connect to database

With Microsoft SQL Server Management Studio For example , hereinafter referred to as （SSMS), The following figure shows the connection failure interface

  processing method : open SQL Server Configuration manager , As shown in the figure, the server status is off ,

  At this point, just restart the service status , Here's the picture

  After reboot , We open it again SSMS that will do , At this time, you can successfully connect to the database