Error when Connecting to SQL Server

Question

I was working with an instance of SQL Server 2012, but after updating my Avast (anti-virus) I can't connect to that instance anymore and I have this error message:

TITLE: Registered Servers

Failed to connect to server . (Microsoft.SqlServer.ConnectionInfo) ADDITIONAL INFORMATION: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - Aucune connexion n’a pu être établie car l’ordinateur cible l’a expressément refusée.) (Microsoft SQL Server, Error: 10061) Aucune connexion n’a pu être établie car l’ordinateur cible l’a expressément refusée BUTTONS: OK "

I just want to be precise that I have allowed all TCP/IP connection rules from my firewall system and each time I try to start the server from the SQL Server Management Studio it doesn't work :(

What should I do ?

Answer 1

Check is SQL Server(MSSQLSERVER) service is running or not.

RightClick on MYComputer->Manage->Service and Application->Services->SQL Server(MSSQLSERVER)

Right Click on it and start it, then try to connect Sql Server.

Answer 2

services.msc just use this commend in cmd, then find out (sql server) then start it simply , will work

Answer 3

I also experience the same issue and this was i did to resolve the issue

. i went to my computer . lunch sql server manager . right-click on (MSSQLSERVER) . and click on propertiesand check buit-in-account radio button . select network service from the drop down and press apply and ok

That was all. Hope this work