SSMS fails to connect to SQL Server

Microsoft SQL Server Management Studio cannot connect to SQL Server

Unable to connect to (computer name)//(server name)

——————————-
FURTHER INFORMATION:

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server is not found or inaccessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 25 – Connection string is invalid) (Microsoft SQL Server, error: 87)

Please take the opportunity to connect and share this video with your friends and family if you find it useful.