Remote Desktop and Server 2012

We are upgrading to Server 2012 R2 Standard.   We have set up the Remote Desktop Services and licenses are installed.    Began to test connection to our thin clients which are Televideo TC7350I (which are quite old)
We cannot get a connections.   It says on the error window, the most likely causes for this error are:
1.  a network error occurred while establishing the connection
2.  the maximum number of connections was exceeded at the remote computer.  ( 50 licenses and this on one user testing against new server)
3.  remote connections might not be enabled at the remote computer.  (verified this is ENABLED)

Anyone have any ideas?
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Lee W, MVPTechnology and Business Process AdvisorCommented:
The old clients probably don't support RDP 6.0 and later.

Reference this blog (and quoting it below):

We had to get a definitive answer, so we opened a support call with Microsoft. The tech first told us to work with the thin client vendors to solve the problem. However, we really wanted to get an answer to the RDP version question. She checked and confirmed that:

Only RDP 6 and later is supported with Server 2012.
RDP 5.x clients CANNOT connect, except as follows:
RDP 5.x clients CAN connect if no license server is activated. In this case, Server 2012 RDS does not issue any license to the client, and allows the client to connect at a low encryption level, 512 bits. However, when a RDS license server is activated, a higher level of encryption is required (2048 bits) and RDP 5.x cannot support this level of encryption. Therefore, the RDP 5.x client can no longer connect.

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You can use this site to verify that your ports are open.
By default in firewall Remote desktop is disabled from public networks.RemoteDektopFirewall
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Windows Server 2012

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