What John says in his answer is correct, but doesn't seem quite responsive to the question.
When people talk about a port being open, what they really mean is that there is a reachable port that will accept input which will be processed by a program. In order for network communication to occur, you need the Three P's: a Program that has created a Port, that ...
Yes, because you opened it in your Router \ Modem \ Windows Firewall
An open port doesn't necessarily post a security issue, but a port scanner could determine what kind of programs or services you are using and try to explore it.
If you opened the port separately from Minecraft (the implication in your post is that you did), then the port (for port forwarding) will remain open.
Type netstat -ab in an admin command prompt to see what ports are listening.
You will need to close it (the way you opened it) if you do not want it open.
I found a tool called chisel that let me do exactly what I wanted to do.
For this you will have to have some kind of a way to execute commands. I was able to upload the executable file to the server and work with it.
chisel server --reverse --port 9001 # Client side
This will start a reverse proxy and listen on port 9001 for any connections on the client ...
The device's manual interestingly doesn't have any information how to configure port forwarding.
I don't have this router, so I can't say what's supposed to be on the Interface so I suppose that's the only available option, and thus correct. This is what rest of it means:
SourceIpAddress - the public IP provided by your ISP
InternalHost - static internal ...
Is there a way to make SSH tunnel all port traffic such that it would simulate the PCs being on the same network? Almost like a VPN into my home network (maybe I should just set one of those up independent of SSH?). I think this would solve my problem immediately, but not sure if it's possible.
No. You really should just use a VPN.
One of the reasons is ...
It depends on what you mean by "open". Take Nmap (a commonly used port scanner) and the definitions it uses (from Nmap Reference Guide, Port Scanning Basics; emphasis mine):
The six port states recognized by Nmap
An application is actively accepting TCP connections, UDP datagrams or SCTP associations on this port. Finding these is often the ...