A few weeks ago Microsoft released an update for Windows 7 SP1 which updates the RDP client to version 8.0 so that it can be used in conjunction with the latest protocols in Windows 8 and Server 2012. Under some circumstances the update will fail to apply and Remote Desktop will fail to connect, especially if using a Remote Desktop Gateway.
A valid gateway address must be specified.
Control Panel -> Programs -> Uninstall Program -> View Installed Updates. You should then download and install KB2574819 which adds support for DTLS in Windows 7. This protocol allows client and server applications to communicate in a way that is designed to prevent eavesdropping, tampering, or message forgery, and is required only if you intend to use Remote Desktop.
You can then open Remote Desktop settings and configure remote desktop gateway with a port number.
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