A network-related or instance-specific error occurred while establishing a connection to SQL Server hatası

A network-related or instance-specific error occurred while establishing a connection to SQL Server hatası

Microsoft SQL Server Management Studio ile SQL sunucuya bağlanmak istediğimde aşağıda gibi hata ile karşılaşıyorum:

Connect to Server

Cannot connect to ....\SQLEXPRESS

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: SQL Network Interfaces, error: 26 - Error Locating server / Instance Specified) (Microsoft SQL Server)"

A network-related or instance-specific error occurred while establishing a connection to SQL Server.  hatasının çözümü nedir?

çözüm : http://uzmanim.net/soru/a-network-related-or-instance-specific-error-occurred-while-establishing-a-connection-to-sql-server-hatasi/1704