Windows 2016 Server
OK, the other day my port 53 became unavailable, I did not find out about it, until last night.
All my other ports are reachable, but port 53 is NOT.
I have it opened in my Router, and I can telnet 53 on the VM Server itself.
The servers have been running fine for several months.
Can someone please let me know what I need to check, as this has all my sites down as well as the Mail Server.