i am reading about: Is the client attempting to connect on the correct network interface?
On a server with more than one network interface, SQL Server might not be configured to accept connections on all of them. You can verify which network interfaces a Database Engine instance is configured to use through SQL Server Configuration Manager. If an instance is not listening on all of a server’s network interfaces, verify that the client is attempting to connect to an interface being used by SQL Server.
what's the mean?