problem forwarding port to desktop

If the Windows firewall is on at the desktop, you may have to open that port in the Windows firewall settings as well. In that case, it would make sense that when you forward that port, it's seen as closed.

I created a rule on windows firewall for the port.  its allowed on all networks.  I even tried disabling the firewall.  The desktop was formatted and windows was reinstalled. no other antivirus or firewall is installed at this moment.

Check the Nat. I think the cysm port check is probably misleading and not actually getting to the intended desktop. You could post the relevant config info of the router if you want more specific help.

@Stephen Berk.  Why would it work for the server and not the desktop?

I don't know. I never troubleshoot that way, asking why something is happening now when it didn't happen before. I just take the problem and start troubleshooting. You created two nats or forwarding rules. One works and one doesn't. That's your problem definition. You say that when you disabled the port forward on the desktop, it was still forwarding. That doesn't make sense. Your router won't port forward unless you configure it to. So either the website is mistaken, or you have something misconfigured on the router. Let's assume the latter and have a look at the configuration. At least that's what I'd be interested in looking at. Others may have additional suggestions.

I didn't say it was still forwarding, I stated when I remove the port forwarding rule from the router, the website, canyouseeme.org, states it can see the computer on that port.  When I add it back, the website can no longer detect it.

How do I provide the configuration?  screen shots?

Please provide the make/model of your router, and also a screen capture of both of the port forwarding rules that you're using for this purpose (server and workstation).

netgear r4500

never received a solution for the problem.