SQL Server- a network-related or instance-specific error occurred while establishing a connection to sql server

Error Details or symptoms: Can not connect to a SQL server and you get a error a network-related or instance-specific error occurred while establishing a connection to sql server

This error is seen in SQL Express installation as its installed a named instance by default with name of instance as Servername/SQLExpress.

Some other Errors Similar:

provider: named pipes provider, error: 40 – could not open a connection to sql server which is covered here.

provider: sql network interfaces, error: 26 – error locating server/instance specified which is covered here.

Resolution:

If we are connecting from … Read the rest