I need your help with regards to an issue that we faced in our environment.
I have replaced a former administrator in the company, and in the day he left, some of the critical services in the company stopped working. The first thing I did was to go to the Management Tab in the SmartView Tracker and check all the changes that was made on the day the problem started.
I found many changes, and one of the them was ralated to UDP stateful inspection. He swicthed off this firewall property in the global configuration mode. Since the service that was impacted uses UDP ports 2123, and 2152, this service was having problems and our clients were not able to establish connection.
Once we switched back on the UDP statefull inspection in the global configuration, everything started working just fine.
I now need a a technical explanation to present to the Management as to how unchecking UDP Statefull inspection caused the issue. That is why I wish to ask if you can share more information about Statefull Inspection, or refer me to a documentation that I can read.
Thanks in advance.