It has no path, no additional details, no explanation to why it's being blocked.
I can't add an exception, see it in the rules or anything. What is this and why is it doing this?
It appears to be the same as this ticket.
"System has been blocked" firewall. How to override "System" to allow? — The Bitdefender Expert Community
I have encountered this today when dealing with OpenVPN Connect.
Looking at the running processes on the system I'd guess it's the one shown below
Opening the properties of said process via the right click menu seems to point at ntoskrnl.exe. Windows NT OS Kernel at a guess.
