New Win7 Home Pc cannot connect via RDP to server

A client of mine just replaced their one pc at home. Their old XP box got very old and slow so they purchased a new Win 7 home box.

The Win 2008 server at work allows me to connect remotely by rdp with no problem and no changes were made so the user shouldn't have a server or acount related problem.

The Win 7 came with AVG free. I thought it might be blocking port 3389 or any remote connection rule. I uninstalled it to eliminate the possibility.

The new PC can ping the server, but cannot connect by RDP. I remoted into their new pc and verified they are using correct credentials (domain\username).
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Tony GiangrecoAsked:
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XaelianCommented:
They are using public IP to connect to server? or with a VPN comnection? Do they use the IP-adress when they RDP? What's in the errorlog?
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
The Windows Firewall might still or instead be blocking.
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Tony GiangrecoAuthor Commented:
Dyndns is installed on the server. i've tried the Dydns name assigned by that service and IP assigned to the name. remotely from home, on both of our pc's, I can ping the server dns name and ip address and receive 4 replies.

I can also login into the server remotely by RDP. I can't from her's using the remote destop connection app in Windows.

I also disabled the firewall and tried. Windows defender is not enabled.
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Svet PaperovIT ManagerCommented:
Did you check the event viewer for any errors?

RDC on Windows 7 supports NLA and it can be configured to not allow connection if the server identity cannot be verified. You should check its RDC, in Advanced tab, what is the the action if the server authentication fails.
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Tony GiangrecoAuthor Commented:
It was a combination of errors.
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