RDP and using port Numbers

Im working for a small town fire department.  They do not have a static IP so they use DYDNS and a Netgear WNDR4500.  Outside and Inside when they RDP they use the port number to get to a specific computer.  I want to turn this off but I am not sure where to look.  Anyone have any ideas?
ffemt968Asked:
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XaelianConnect With a Mentor Commented:
Log in to the firewall and change the port forwarding. Just block all the ports and only allow port 3389 and 3390 (RDP-Ports) and the basic ports like ftp, ssh, http, https, SMTP, ... the other ports are a security concern.
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Brad BouchardConnect With a Mentor Information Systems Security OfficerCommented:
Look in the WNDR4500 and look for Port Forwarding, or Single Port Forwarding.  There is probably something there.  Also, look in the NAT/NAT Policy section if it has one.
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ViperdmbConnect With a Mentor Commented:
Port Forwarding is where you should go, there is probably one for each port.

http://screenshots.portforward.com/Netgear/WNDR4500/Port_Forwarding.htm
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ffemt968Author Commented:
Everything Else does just fine when I RDP to the server it says its not connected.  Remote Desktop is allowed.
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Brad BouchardInformation Systems Security OfficerCommented:
That's because you need to tell the Netgear to only allow 3389 to the server.
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ffemt968Author Commented:
I think its a server issue.  For instance the Server was named ABC123 on a normal network I just go to RDP and type in ABC123 and it RDP's.  This server will not do so.  Sadly I am undoing someone else's work so I am trying to figure why it does this.  Allow Remote Connections is checked.  The user names are on the remote desktop users list.  I can RDP to every other machine.
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ViperdmbCommented:
Verify what port the Server is listening on.

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp\PortNumber
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Brad BouchardInformation Systems Security OfficerCommented:
Then that's a DNS issue.
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