SQL connection problem after downloading (2)

title : Connect to the server
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Can't connect to DESKTOP-A8Q2PDV\MSSQLERVER.

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Other information :

With the SQL Server A network related or instance specific error occurred while establishing the connection . Server not found or unreachable . Verify that the instance name is correct and SQL Server Configured to allow remote connections . (provider: SQL Network Interfaces, error: 26 - Locate the specified server / Error in instance ) (Microsoft SQL Server, error : -1)

I haven't met it myself , Solving （ Question 1 ） According to the operation of online search

If there is a connection problem, you can

　１. This computer —（ Right click ）— management —— Services and Applications

double-click 　SQLSｅｒｖｅｒ Configuration manager 　（ If the page doesn't have SQL Configuration manager , It means that there is a problem when downloading , The configuration manager is in SQL Self existing when downloading , The stupid way I use is to download SQL Uninstall all relevant files , Again , Look at the problem step by step ）

２. double-click SQLＳｅｒｖｅｒ service  

３. double-click SQL service , take SQL agent 　 Right click 　 start-up  

４. stay SQLＳｅｒｖｅｒ Click... In network configuration MＳＳＱＬＳＥＲＶＥＲ  The agreement , As shown in the figure below, it changes to start

５. Reopen SQL　 In theory, it's ok

But when I write a blog, I want to make a connection error again , After changing the agency and agreement to prohibit , I'm still connected 　

(*Φ Dish Φ*)　 The software installation is amazing