To prove this, ssh to a machine where the messaging service is running.
To see the list of network connections in TIME_WAIT state, run:
I found 1000-2000 such connections.
Take the port of the connection with the largest number and determine the process id (it will be the last column):
Take the process id, and you'll see that it is of the messaging service:
This means that the clients talking to messaging service keep closing and recreating new connections, frequently.