"None of the specified endpoints were reachable", "connection.start was never received, likely due to a network timeout"

We are trying to publish a message to a queue to RabbitMQ. We are using .NET Framework 4.7.2. We are having issues with the code below:

var connection = new ConnectionConfiguration()
{
    UserName = "guest",
    Password = "guest",
    VirtualHost = "/",
    PrefetchCount = 1
};

var host = new HostConfiguration()
{
    Host = "localhost",
    Port = 5672,
};

connection.Hosts = new List<HostConfiguration> { host };

using (var bus = RabbitHutch.CreateBus(connection, x =>
{
    x.Register<IConventions>(c => new ErrorConventions(c.Resolve<ITypeNameSerializer>()));
}))
{
    var exchange = bus.Advanced.ExchangeDeclare("ex", ExchangeType.Direct);
    bus.Advanced.Publish(exchange, "test", false, new Message<object>(data));
}

We are using ASP.NET and this code works as expected when we execute it in an .aspx page. However, the exact same code does not work when we execute it through an API function and we always end up getting the following exception:

We are unable to figure out why the exact same code works in the .aspx pages but not in our API.

We are using the following setup for our queue and exchange:

• EasyNetQ version: 6.5.2
• RabbitMQ version: 3.11.15

[zidad]

looks like a “normal” connectivity problem, can’t really say something useful without a reproducible sample with code, can you provide that?

[AkyrosXD]

yes, it;'s fine. thank you anyway 🙂