McHenryB :
You still don't say whether a server is running on the computer you have forwarded the port to, listening on that port. That is an essential part of the process when testing if the port is open on your IP address.
canyouseeme.org isn't listening on that port; it's testing whether your computer is.
Let's make an analogy. You forward telephone calls from one number to another. So when someone rings (let's call it 12345) that call is forwarded to 67890. Now you ask someone to test that by ringing 12345. The call is forwarded to 67890; but unless someone is listening to that phone, and answers the call, the tester will report that there is no answer. So you need the forwarding and the listening to the address forwarded to for the test to give the right result.
similar issue for me as well. but I am trying to forward my port for Counter strike 1.6.
thompson TWG870 (ISP is UPC Austria)router forwarded the port from 2700-27015 UDP, 1200 UDP, 27030-27039 TCP (for my local IP and my current External IP)
my CS server is showing that is up and running on 192.168.0.16:27015 on my PC (192.168.0.16 is my local IP)
choosed dynamic IP under network settings ,ethernet connections
But still i couldn't add my server IP port to game tracker . and canyouseme.com is also falling to see my open port
If I have to choose static Ip under network settings what preferred and alternate DNS server should i enter. My touter dosen't have a straight forward setting for reserving my mac ID to a static local IP as well