A network-related or instance-specific error (Microsoft sql server, Error:2)

The main reason for this may be that the sql server is not started in the services of the computer. Follow the below steps to run sql server in computer services.

go to search bar on your pc — — → search “Services”. After opening the services window go to sql server line

right click on sql server and go to properties. And then click on “Start” and finally Click on “OK”. After that, try to log into sql server management studio again.

If for some reason you are still unable to successfully log in to sql server management studio as the next step

go to search bar on your pc — — → search “Sql Server Configuration Manager”. After opening the Sql Server Configuration Manager window, click on sql server services,

Now you can see sql server state is “stopped”. To make it running, right click on that line and go to properties and click on start. Now it will be run. Try logging into Sql server management studio again, I hope your problem is solved.