@Googie85 

If you set up the virtual servers, you won't need the port triggering.

After doing the port forwarding, use a public port tester to see if the port is actually opened. I tend to use: https://www.yougetsignal.com/tools/open-ports/

If the port still appears closed, place the server in the DMZ then test the port again to make sure they are opened.

If only you are able to connect remotely, then something else may be causing it, reason is if the router was blocking all remote connections, you would not be able to connect as well.

As you were testing on your own device, make sure you were not on the same LAN of the C1200.