Does anyone know why it goes like this and how to solve it? yesterday I was working normal with him but today I went to continue and he does not leave me ...
Check that the SQL Server and SQL Server Browser services on your server are running, you can also check if the configuration has not been moved as ports, and also check that you are on the same server network
It is likely that your SQL Server service is below, so I recommend you check if it is operational. For that, do the following:
Start, Run, type services.msc Search the SQL Server service and its SQL Server Agent Start them with right click, START
The other option is to go to Start, Programs, find the folder related to SQL Server, and open the SQL Server Configuration Manager, and see in the tab SQL Server Services in which state the services are
As a last option, in case all the above is in order, check well if you are entering correctly the name or IP of the instance and its respective port. In the case of a local instance, validate that the name of the server is correctly entered, or a point added only.