I have a client with a Windows 8.1 brand new computer. I use no-ip to allow him to remote into the machine while off-site. He has 3 such machines so each has a different RDP port. For the life of me I can't get the brand new Windows 8.1 machine to have an open port. I tried 3388, 3390....no matter what port I choose, I can't see the port open at canyouseeme. I turned off the firewall, turned it on and added an exception for one port, range of ports, etc. I'm at loss here. I have never had any issues with an XP or Windows 7 machine, seems like something in Windows 8 is causing me an issue.
Also, I checked the logs on the router and I see it the request getting through there just fine.
Anyone have any suggestions?