I am having difficulty with RDP and was hoping for some suggestions. I cannot login to RDP outside the network, only from inside the LAN. All addresses are port forwarded in the router. The machines that I am trying to connect to have Win 7 x64 Ultimate. Here is the scenario and what I have done to troubleshoot:
1) All computers have static ip addresses on the local area network.
2) I have used an online port check tool and the problem I am getting is that ports 3389 and 3390 (the ports I have designated as RDP listenting ports) are showing closed.
I know that the ports showing closed can be due to a few factors, so here are the tests that I ran:
1) I can log into RDP successfully from inside the LAN, so I assume that the problem is not with any type of software firewall configuration. These computers do all have Kaspersky Internet Security on them, but I have no problems connecting inside the netwok.
2) I thought that the router wasn't properly forwarding port addresses so I took the router to another location (Different ISP) and found that RDP works just fine there.
3) Now I'm wondering if the ISP is blocking the port ranges so I took a laptop back to the original location and it works just fine so I know that its not an ISP issue. The only difference I can note is that the laptop (computer that RDP works on), is a 32bit Win 7 Ultimate machine and the other two are x64. Aside from that, all software and internet security settings are the same.
Any thoughts on what might be causing this problem? I'm about to pull my hair out from frustration...
Thanks for any help.