I am looking for a method to test network connectivity on specific port between 2 linux hosts.
Let's say for an example: I am sending syslog events from server A to server B on port 514. However, server B never receive events from Server A. I can confirm server A is sending it and port 514 on server B is opened. For now, I am suspecting that firewall between these servers are blocking 514 connections.
Is there any tool or method that can help to verify if firewall is opened for port 514 in this situation?