Can't Windows 7 access an RD on Server 2012 that uses SHA512/2048-bit certificates

I have a Server 2012 R2 Remote Desktop that works fine if configured with the self-signed certs (SHA1/2048-bit), but not with certs from our internal CA.
With the self-signed certs, our remote clients can connect but of course get security warnings due to the untrusted certificates.  The clients do trust our root CA, so we should be able to eliminate those by using certs from our internal CA instead.
However, when I do configure the Server 2012 R2 RD to use certs generated on our internal CA (SHA512/2048-bit) clients (Windows 7) cannot open RDP sessions.  They get errors and on server event log contain:
(Source: Schannel; Event ID: 36874)  [sic] An TLS 1.2 connection request was received from a remote client application, but none of the cipher suites supported by the client application are supported by the server. The SSL connection request has failed.
(Source: Schannel; Event ID: 36888)  A fatal alert was generated and sent to the remote endpoint. This may result in termination of the connection. The TLS protocol defined fatal error code is 40. The Windows SChannel error state is 1205.
The strange thing is that if I connect from client on Server 2008 R2, it can open RDP session!!!
Thanks.

Hi,
Indicates by the event, it seems that the Cipher Suites use by the client are disabled on the server.
Please check if any Cipher Suites of TLS 1.2 are disabled on the server.
Cipher Suites in Schannel
http://msdn.microsoft.com/en-us/library/windows/desktop/aa374757(v=vs.85).aspx
How to restrict the use of certain cryptographic algorithms and protocols in Schannel.dll
http://support.microsoft.com/kb/245030
Hope this helps.
Jeremy Wu
TechNet Community Support

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