Here is a link to scan your server from the outside. It will basically scan knows ports that can be seen from outside of your network. Don't be allarmed if it warns you of open ports. That's why you are running a server
. Just click on: Proceed --> Contunue --> All Service Ports
https://grc.com/x/ne.dll?bh0bkyd2
I mentioned to close SSH. I meant close it from being accessed from outside of your network if you are not accessing it through the internet
.