RabbitMQ Connection refused 127.0.0.1:5672 - asp.net

Question

I am preparing a simple ASP.NET Core MVC web application.
I have installed RabbitMQ server to my laptop. RabbitMQ Management UI is running on localhost:15672.
Rabbit MQ cluster name is like: rabbit#CR00001.ABC.COM.LOCAL
I am trying to send message to rabbitmq in controller. But I am getting None of the specified endpoints were reachable error.
If I use 'localhost' as host name, I get Connection refused 127.0.0.1:5672 in inner exceptions.
If I use rabbit as host name, I get Name or service not known
I've tried to solve the problem according to other StackOverflow questions, however, none of them could solved my problem.
Home controller:
[HttpPost]
public void SendMessage([FromBody]Message message)
{
try
{
var factory = new ConnectionFactory()
{
UserName = _username,
Password = _password,
HostName = _hostname,
VirtualHost = "/",
Port = _port,
};
using (var connection = factory.CreateConnection())
using (var channel = connection.CreateModel())
{
channel.QueueDeclare(queue: _queueName,
durable: false,
exclusive: false,
autoDelete: false,
arguments: null);
var body = Encoding.UTF8.GetBytes(message.Text);
channel.BasicPublish(exchange: "",
routingKey: _queueName,
basicProperties: null,
body: body);
}
}
catch (Exception ex)
{
}
}
appsettings.json
{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*",
"RabbitMq": {
"Hostname": "localhost",
"QueueName": "WordQueue",
"UserName": "test",
"Password": "test",
"Port": 5672
}
}
Here is test user configuration in Rabbit MQ Management UI

Answer 1

Have you setup your test user in the UI portal? This is probably the cause of your connection refused error. You can setup users via http://localhost:15672/#/users.
You should also debug your factory to check that your config values are being passed in correctly
I would also suggest that you pop some code in your catch to ensure you aren't missing an exception
The references to http://rabbit are for use within containers. These will only work if you are running both your ASPNET and Rabbit applications within a containerised network (for example Docker Compose). I found using containers was a much better approach for learning RabbitMq.
Apprciate that this is going a little off-topic now, but if you are not familiar with containerisation I would suggest taking a look at this post (and the respective series) from Wolfgang Ofner https://www.programmingwithwolfgang.com/rabbitmq-in-an-asp-net-core-3-1-microservice/ and the getting started with Docker from Brad Traversy on YouTube https://www.youtube.com/watch?v=Kyx2PsuwomE

Answer 2

After create user, do not forget set permissions,
basicaly,
can access virtual hosts (/)
set topic permission (AMQP default)
Note: of course you can use rabbitmq ui for this operation (create user and permissions).
var factory = new ConnectionFactory() { HostName = "hostname_or_ip_adres_here", UserName="username here..", Password="psw here.."
};
this will work !