When trying to connect to SQL Server running in a Docker container in WSL I am unable to connect using localhost as the server name. I can, however, connect using 127.0.0.1 or ::1. The application ...

It works fine if the sql server is listening on port 1433 but fails when connecting to sql servers listening on port 1434. Confirmed that there is no network / firewall issues that that is blocking ...

Additionally, it might be due to incorrect connection strings or instance names in your application setup. 1. Gather Information About the Instance of the SQL Server. In this section, we will discuss ...

A network related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible.

Run SQL Server in compatibility mode if you are getting the Your operating system is not supported by sql server error message.

If that did not do the trick, then make sure you are connecting to the right port of the SQL server (especially if you are using the server in a multi-server environment).