ASP.NET Core with Docker support: Connection refused

user_4070724 0
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I have a ASP .NET Core (v2.0) app with Docker support. And I want to start a Oracle Database when starting my app. This is how my docker-compose file looks like:

version: '3'

services:
  devarttestapp:
    image: devarttestapp
    build:
      context: ./DevartTestApp
      dockerfile: Dockerfile

  oracledb:
    image: sath89/oracle-12c
    ports: 
      - "1521:1521"

I use Devart data provider dotConnect for Oracle.

var conn = new Devart.Data.Oracle.OracleConnection();
conn.ConnectionString = Environment.GetEnvironmentVariable("ORACLE_CONNECTION_STRING");
try
{
    conn.Open();
}
catch (Exception e)
{
    Console.WriteLine(e);
    throw;
}

But when I try to connect to the database of the created Oracle DB container I get following exception:

System.Net.Internals.SocketExceptionFactory+ExtendedSocketException (Connection refused 127.0.0.1:1521)

I also tried to include the depends_on as well as the networks option in my docker-compose file with the same results.

What could be the cause of this exception?
And how do I solve this problem?

docker oracle asp.net .net
3 Answers

I faced with the same problem on my mac. I solved it using port that > 9000.

user_3984290

Just add SslMode=None; in your connection string 

  "ConnectionStrings": {
    "DefaultConnection": "Server=db-host; Database=db-name; Uid=db-user; Pwd=db-pwd; SslMode=None;"
  },
user_111732580
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