org.springframework.amqp.AmqpConnectException: java.net.ConnectException: Connection refused: connect

The error "org.springframework.amqp.AmqpConnectException: java.net.ConnectException: Connection refused: connect" occurs when a connection cannot be established between the client and the RabbitMQ server.

There could be several reasons for this error:

1. The RabbitMQ server is not running or is not reachable from the client machine.
2. The port on which the RabbitMQ server is running is blocked by a firewall.
3. The connection string or credentials provided are incorrect.

To resolve this issue, you can try the following steps:

1. Verify that the RabbitMQ server is running and reachable from the client machine.
2. Check if the port on which the RabbitMQ server is running is accessible from the client machine. You can use telnet to check if the port is open.
3. Verify that the connection string and credentials provided are correct.
4. Ensure that there are no network issues between the client and server machines.

If the issue persists, you may need to consult the RabbitMQ documentation or seek assistance from a RabbitMQ expert.