How I can continuously log processes connected to a socket

I have a project with an architecture based on a RabbitMQ queue. Each day at 00:30 triggered by a CRON job, the producer process gets the information from a web page and writes in the queue in order to send the information to the consumer process which is subscribed to the queue.

It works fine, but, randomly I get a message in the queue around 2 hours later(It is not fixed, can be at 03.16 or at 03:44). I activated the log with RabbitMQ but I am not able to see which processes are opening that TCP socket. So I would like to log all processes that open a socket on the listening port (the queue) in order to see which process is writing randomly the queue.