Issue occurs when trying to connect to: - `(local)\SQLServer` - `(local)` NoSql Possible solutions: - use IP instead of `(local)` OR named instances - create users and modify connection string by adding `user_name` and `password` - modify firewall rules for ports etc... Links: - https://vivekcek.wordpress.com/2018/06/10/connecting-to-local-or-remote-sql-server-from-docker-container/ - https://jack-vanlightly.com/blog/2017/9/24/how-to-connect-to-your-local-sql-server-from-inside-docker - https://stackoverflow.com/questions/48145881/can-not-connect-to-sql-server-from-docker-supported-asp-net-core-project