TCP Retransmission/HTTPS down NSA 5600
I have an urgent question in regards to TCP traffic issue on our network.
Our clients stay wired/wireless connected, but the browser and all HTTP/HTTPS app down. Ping was working.
We use PRTG monitoring system to monitor. So from the sensors dashboard, the data match what we observed:
HTTP/HTTPS sensors were down at all Switch/AP/clients. Firewall HTTP/HTTPS are up as well as other sensors. In the meantime, the firewall showed some port scans attack detected logs.
It happens a couple of times now.
Has anyone experienced the similar issue? And what could be cause? is it a Firewall or switch issue?
Thanks for taking time to read my post. All discussions are welcomed!