I had this problem, and finally I could solve it by adding the "Ssl" property of the ConnectionFactory class, with the "ServerName" sub-property specified.

Here is what I did, and it connected to the Rabbit MQ server. Please pay attention to the "ServerName" part of the code below:

var rabbitMqConnectionFactory
    = new ConnectionFactory
        {
            HostName = rabbitMqHostName,
            Port = rabbitMqPort,
            UserName = rabbitMqUserName,
            Password = rabbitMqPassword,
            VirtualHost = rabbitMqVirtualHost,
            RequestedHeartbeat = 60,
            Ssl =
                {
                    **ServerName** = rabbitMqHostName,
                    Enabled = useSsl
                }
        };

It's hard to say whats the exactly problem, but one of the reason that cause to occur such issue is RabbitMQ heart beat, you can change this value. for more information you can check this linke Detecting Dead TCP Connections with Heartbeats

ConnectionFactory cf = new ConnectionFactory();

// set the heartbeat timeout to 60 seconds
cf.setRequestedHeartbeat(60);

I have had the same problem and I solved it by creating new RabbitMQ Docker Container with docker compose:

 rabbitmq:
    container_name: rabbitmq
    tty: true
    hostname: rabbitmq
    ports:
      - "15672:15672"
      - "5672:5672"
    image: rabbitmq:3-management
    environment:
      - RABBITMQ_DEFAULT_USER=user
      - RABBITMQ_DEFAULT_PASS=password

And to access it with trough the code I had to set in my appsettings.json file the host as the my localhost IP Address:

"RabbitMqSend": {
"Hostname": "192.168.0.12",
"QueueName": "SendQueue",
"UserName": "user",
"Password": "password"},

With this it worked for me.