Can't connect to SQL Server express from .net core app running on docker

Question

I have SQL Server 2016 Express, docker for Windows and IIS installed on my Windows 10 machine.

SQL Server Express is configured to listen on 1455 port. The Northwind

Answer 1

The problem was I didn't disable Windows Firewall correctly.

I turned off Windows Firewall, but only on Domain networks. Windows sees the DockerNAT adapter as a public network. So Windows firewall was blocking the connection to SQL Server.

I turned off Windows Firewall on public networks and I can connect now.